Light Worksheet

Objective Type Questions

1. Match the following:
   
    
2. State whether the statement is true or false:
   Riya observed that when she placed an object far from a concave mirror, the image formed was virtual and erect.
    
3. Images formed by regular reflection are always _______ and _______.
    
4. When Sheetal looks at her reflection on the inner side of a spoon, her image appears to be vertically inverted, indicating that it acts as a _______ mirror.
    
5. Unscramble the following words:
   (a) SIONPDISRE
   (b) QUEOPA
   (c) WODHAS
   (d) XOVENC
   
   
6. Pick odd one out:
   Prism, Compact disc, Rainbow, Plane mirror. 
    
   Multiple Choice Questions
   
   
7. What is the relation between angle of incidence and angle of reflection?
   (a) They are vertically opposite.
   (b) They are complementary angles.
   (c) They are supplementary angles.
   (d) They are equal.
    
8. Riya is on the highway and wishes to change lanes. She looks in her rear-view mirror and notices a vehicle approaching from behind. She notices that the car looks smaller in the mirror than it does when she looks at it directly.
   What can Riya deduce from the above scenario. Choose the most appropriate option among the following.
   (a) The rear-view mirror is a concave mirror that produces both a real and an inverted image.
   (b) A convex mirror forms a virtual and erect image in the rear-view mirror.
   (c) The rear-view mirror is a plane mirror that produces an erect and virtual image.
   (d) The rear-view mirror is a parabolic mirror that produces both a real and an inverted image.
    
9. Suppose Sharadha stands 50 cm away from a plane mirror. What is the distance between her, and the image formed by the mirror?
   (a) 1 m
   (b) 2 m
   (c) 0.5 m
   (d) 2.5 m
   
   
10. A lens and an object were given to Samir by the teacher. He placed the object in front of the lens and obtained an upright and magnified image. According to Samir, the lens he is using can be ______.
    i.Concave lens
    ii.Convex lens
    Choose the correct option among the following.
    (a) Only i is correct
    (b) Only ii is correct
    (c) Both i and ii are correct
    (d) Neither i nor ii are correct
     
11. In a class demonstration, Aarav notices that when objects are placed very close to a concave mirror, no image is formed. What conclusions can be drawn from this observation?
    (a) Concave mirrors form virtual, upright images at all distances.
    (b) Concave mirrors form real, inverted images only when the object is far away.
    (c) Concave mirrors do not form images when the object is too close.
    (d) Concave mirrors form virtual, upright images when the object is too close.
    
    
12. During a science fair, a Prachi observes that when a glass of water is placed in sunlight, a rainbow-like pattern appears on a white paper placed under the glass. What causes this colourful pattern?
    (a) Sunlight passing through the glass refracts and forms a spectrum of colours.
    (b) The glass reflects the colours from objects around it onto the paper.
    (c) The glass absorbs certain colours and only reflects others.
    (d) The paper reacts chemically with the glass and changes colour.
    
    Subjective Questions
     
13. Sivananda is looking at a candle flame through a bent pipe, as shown in the figure below. What will he most likely notice. What can we deduce about characteristics of light from this activity?
    
    
    
14. Ram placed a candle in front of a convex mirror at certain distance u, based on this he drew the ray diagram and concluded that the image formed by the mirror will be real, erect and diminish. Is Ram’s observation, correct? Justify your answer. 
    
    
    
15. List down the properties of different types of mirrors such as plane, convex and concave mirror and evaluate which type would be most suitable for use in a car’s side mirror. Justify your answer.
    
     
16. In Rajiv's message to her brother, he said he could only see the rainbow if he turned in a direction opposite to the sun. Analyse Rajiv's statement and explain why the position of the sun is important for seeing a rainbow.
    
    Assertion-Reasoning Questions
    
    Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:
     
    
    
17. Assertion:  Faiz is looking at himself in a plane mirror. The mirror and his image are 2 metres apart. If he moves one metre closer to the mirror, the distance between Faiz and his image will be 3 m.
    Reason:  The object distance is equal to the image distance for plane mirrors.
     
18. Assertion:  When a lens is placed on top of textbook the letters will appear bigger if it’s convex lens.
    Reason:  Concave lens produce diminish image.
     
19. Assertion: In front of a huge glass building, Ajay waved his right hand and observed that the reflection was waving back its left hand.
    Reason: A plane glass mirror produce upside down image.
    
    Case-Based Questions
     
20. Mridul is travelling with his family in their car on a highway. His father is driving the car and Mridul is sitting in the back seat. Suddenly, Mridul hears a loud siren and sees an ambulance approaching from behind though a rear-view mirror.
    
    His father checks the rear-view mirror and moves the car to the side of the road to let the ambulance pass.
    Answer the following questions based on the given information.
    (a) Describe the image Mridul's father sees in his rear-view mirror. Is it real or virtual image?
    (b) While viewing through the mirror Mridul notice that a phrase was written on “OBJECTS IN THE MIRROR ARE CLOSER THAN THEY APPEAR”. What does this indicate?
    (c) What kind of mirror is used as a rear-view mirror? Why is this type of mirror used as opposed to others?
    (d) In comparison to other types of mirrors, what advantages does this type of mirror provide the driver?

Objective Type Questions

1. Match the following:
   
   Solutions:
   
    
2. State whether the statement is true or false:
   Riya observed that when she placed an object far from a concave mirror, the image formed was virtual and erect.
   Correct answer: False
   Solutions: When the object is far from a concave mirror, the image formed is real and inverted.
    
3. Images formed by regular reflection are always _______ and _______.
   Correct answer: clear, distinct.
   Solutions: Images formed by regular reflection are always clear and distinct.
    
4. When Sheetal looks at her reflection on the inner side of a spoon, her image appears to be vertically inverted, indicating that it acts as a _______ mirror.
   Correct answer: concave
   Solutions: When Sheetal looks at her reflection on the outer side of a spoon, her image appears to be vertically inverted, indicating that it acts as a concave mirror.
   i.e., We cannot get an inverted image with convex mirror.
 
5. Unscramble the following words:
   (a) SIONPDISRE
   (b) QUEOPA
   (c) WODHAS
   (d) XOVENC
   Solutions:
   (a) DISPERSION
   (b) OPAQUE
   (c) SHADOW
   (d) CONVEX 
   
   
6. Pick odd one out:
   Prism, Compact disc, Rainbow, Plane mirror. 
   Correct answer: plane mirror
   Solutions: The odd one out in this list is the plane mirror. A prism, compact disc, and rainbow are all related to the dispersion of light, while a plane mirror is not.
    
   Multiple Choice Questions
   
   
7. What is the relation between angle of incidence and angle of reflection?
   (a) They are vertically opposite.
   (b) They are complementary angles.
   (c) They are supplementary angles.
   (d) They are equal.
   Correct answer: (d) They are equal.
   Solution: The law of reflection states that the angle of incidence is equal to the angle of reflection. The other options are incorrect because they do not follow the law of reflection.
   
    
8. Riya is on the highway and wishes to change lanes. She looks in her rear-view mirror and notices a vehicle approaching from behind. She notices that the car looks smaller in the mirror than it does when she looks at it directly.
   What can Riya deduce from the above scenario. Choose the most appropriate option among the following.
   (a) The rear-view mirror is a concave mirror that produces both a real and an inverted image.
   (b) A convex mirror forms a virtual and erect image in the rear-view mirror.
   (c) The rear-view mirror is a plane mirror that produces an erect and virtual image.
   (d) The rear-view mirror is a parabolic mirror that produces both a real and an inverted image.
   Correct answer: (b)- A convex mirror forms a virtual and erect image in the rear-view mirror.
   Solution: As we know, convex mirrors produce virtual, erect, and diminished images of objects. In the scenario above, Riya notices that the car appears smaller in the mirror than it would if she were looking at it directly, indicating that the rear-view mirror is a convex mirror.
    
9. Suppose Sharadha stands 50 cm away from a plane mirror. What is the distance between her, and the image formed by the mirror?
   (a) 1 m
   (b) 2 m
   (c) 0.5 m
   (d) 2.5 m
   Correct answer: (a) 1 m
   Solution: The distance between Sharadha and her mirror image is equal to the sum of object distance (Distance between mirror and Shradha) and image distance (Distance between mirror and Shradha’s image)
   Distance between Shardha and her image, d = 50 cm + 50 cm
   i.e., d = 100 cm or 1 m.
   
   
10. A lens and an object were given to Samir by the teacher. He placed the object in front of the lens and obtained an upright and magnified image. According to Samir, the lens he is using can be ______.
    i.Concave lens
    ii.Convex lens
    Choose the correct option among the following.
    (a) Only i is correct
    (b) Only ii is correct
    (c) Both i and ii are correct
    (d) Neither i nor ii are correct
    Correct answer: (b) Only ii is correct.
    Solution: As we know, a concave lens diverges light rays and forms a virtual, upright, and diminished image of an object placed in front of it.
    Whereas for a convex lens it can produce virtual, upright, and magnified image when object is between focus and lens as shown below.
    
     
11. In a class demonstration, Aarav notices that when objects are placed very close to a concave mirror, no image is formed. What conclusions can be drawn from this observation?
    (a) Concave mirrors form virtual, upright images at all distances.
    (b) Concave mirrors form real, inverted images only when the object is far away.
    (c) Concave mirrors do not form images when the object is too close.
    (d) Concave mirrors form virtual, upright images when the object is too close.
    Correct answer: (d) Concave mirrors form virtual, upright images when the object is too close.
    Solution: When an object is put ve-ry close to a concave mirror, the image generated is virtual, upright, and enlarged.
    
    
    
12. During a science fair, a Prachi observes that when a glass of water is placed in sunlight, a rainbow-like pattern appears on a white paper placed under the glass. What causes this colourful pattern?
    (a) Sunlight passing through the glass refracts and forms a spectrum of colours.
    (b) The glass reflects the colours from objects around it onto the paper.
    (c) The glass absorbs certain colours and only reflects others.
    (d) The paper reacts chemically with the glass and changes colour.
    Correct answer: (a) Sunlight passing through the glass refracts and forms a spectrum of colours.
    Solution: The rainbow-like pattern on the paper is caused by the refraction of sunlight as it passes through the glass of water, splitting into its component colours.
    
    Subjective Questions
     
13. Sivananda is looking at a candle flame through a bent pipe, as shown in the figure below. What will he most likely notice. What can we deduce about characteristics of light from this activity?
    
    Solutions: Sivananda will most likely notice that he can't see the candle's flame through the bent pipe. This is because one of the characteristics of light is that it travels in a straight line. Hence from this we can conclude that light travels in a straight line and does not bend around corners.
    
    
14. Ram placed a candle in front of a convex mirror at certain distance u, based on this he drew the ray diagram and concluded that the image formed by the mirror will be real, erect and diminish. Is Ram’s observation, correct? Justify your answer. 
    
    Solutions: A convex mirror always forms a virtual, erect, and diminished image, regardless of distance from the object. Hence for the given case, Ram’s observation is incorrect.
    
    
15. List down the properties of different types of mirrors such as plane, convex and concave mirror and evaluate which type would be most suitable for use in a car’s side mirror. Justify your answer.
    
    Solutions: Convex mirrors are the most suitable type of mirror for use in a car's side mirror, as they reflect light outwards and produce a virtual image that looks smaller from a distance but gets larger as the object is closer.
    
    key properties of plane, convex and concave mirrors are as follows:
    
     
16. In Rajiv's message to her brother, he said he could only see the rainbow if he turned in a direction opposite to the sun. Analyse Rajiv's statement and explain why the position of the sun is important for seeing a rainbow.
    Solutions: As we know, a rainbow is formed when sunlight falls on water droplets and is seen in the opposite direction of the sun. Hence Rajiv’s statement is correct.
    
    Assertion-Reasoning Questions
    
    Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:
     
    
    
17. Assertion:  Faiz is looking at himself in a plane mirror. The mirror and his image are 2 metres apart. If he moves one metre closer to the mirror, the distance between Faiz and his image will be 3 m.
    Reason:  The object distance is equal to the image distance for plane mirrors.
    Correct answer: (d) A is false, but R is true.
    Solution: As we know the object distance is equal to the image distance for plane mirrors. i.e., the image is as far behind the mirror as the object is in front of it.
    And according to assertion statement, Faiz and his image are 3 metres apart is false, because moving one metre closer to the mirror reduces the distance between Faiz and mirror to one metre as a result the distance between him and his image will be 2 meter (1 meter + 1 meter).
    
    
18. Assertion:  When a lens is placed on top of textbook the letters will appear bigger if it’s convex lens.
    Reason:  Concave lens produce diminish image.
    Correct answer: (b) Both A and R are true, but R is not the correct explanation of the assertion. 
    Solution: The assertion states that if a convex lens is placed on top of a textbook, the letters will appear larger. The reason given is that concave lenses produce a diminished image. Thus, the given lens cannot be concave and must be convex. As a result, both the assertion and the reason are correct, but R is not the correct explanation of the assertion.
 
19. Assertion: In front of a huge glass building, Ajay waved his right hand and observed that the reflection was waving back its left hand.
    Reason: A plane glass mirror produce upside down image.
    Correct answer: (c) A is true, but R is false.
    Solution: Ajay waved his right hand in front of a large glass building and noticed that his reflection was waving its left hand. This occurred because a plane mirror flips the image horizontally.
    Whereas reason given is incorrect since, a plane mirror does not produce an upside-down image, but rather a laterally inverted image.
    
    Case-Based Questions
     
20. Mridul is travelling with his family in their car on a highway. His father is driving the car and Mridul is sitting in the back seat. Suddenly, Mridul hears a loud siren and sees an ambulance approaching from behind though a rear-view mirror.
    
    His father checks the rear-view mirror and moves the car to the side of the road to let the ambulance pass.
    Answer the following questions based on the given information.
    (a) Describe the image Mridul's father sees in his rear-view mirror. Is it real or virtual image?
    Solutions: In his rear-view mirror, Mridul's father sees a virtual image of the ambulance approaching from behind. As shown in the figure below, a virtual image is formed when light rays appear to originate from a point but do not actually meet.
    
    
    (b) While viewing through the mirror Mridul notice that a phrase was written on “OBJECTS IN THE MIRROR ARE CLOSER THAN THEY APPEAR”. What does this indicate?
    Solutions:  The phrase “OBJECTS IN THE MIRROR ARE CLOSER THAN THEY APPEAR” is a safety warning that is often printed on side-mirrors of vehicles. It indicates that the mirror has a convex shape, which can make objects appear smaller and further away than they actually are.
    
    (c) What kind of mirror is used as a rear-view mirror? Why is this type of mirror used as opposed to others?
    Solutions: The type of mirror used as a rear-view mirror is a convex mirror. This type of mirror is used because it provides a larger field of view than a flat mirror, allowing the driver to see more of the road behind them.
    
    (d) In comparison to other types of mirrors, what advantages does this type of mirror provide the driver?
    Solutions: The advantage of using a convex mirror as a rear-view mirror is that it provides the driver with a wider field of view, allowing them to see more of the road behind them. This can help the driver to see approaching vehicles and other potential hazards more easily, improving their safety while driving.