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Light Worksheet

Objective Type Questions

  1. Match the following:


    State whether the statement is true or false:
  2. Regular reflection occurs when light waves bounce off a smooth surface at the same angle they hit.

    State whether the statement is true or false:
  3. The laws of reflection state that the angle of incidence (i) is always greater than the angle of reflection (r).

  4. Label the diagram:
    The below image shows the structure of the human eye. Complete the following
    diagram with appropriate labels.


  5. Match items in List A with the item in List B:


  6. Unscramble the following words:
    (a) BEILRAL
    (b)KELOIDASCOPE
    (c) LIPUP

    Multiple Choice Questions

  7. If you were to place a non-luminous object in a completely dark room with no light sources, would you be able to see it?
    (a) Yes, because all objects are visible in the dark.
    (b) No, because there is no light to reflect off the object.
    (c) Yes, because the object will eventually start emitting light.
    (d) No, because the object will absorb all the light in the room.

  8. In a ray diagram showing the reflection of light from a mirror, the incident ray is represented by:
    (a) A solid line with an arrow pointing towards the mirror.
    (b) A dashed line with an arrow pointing towards the mirror.
    (c) A solid line with an arrow pointing away from the mirror.
    (d) A dashed line with an arrow pointing away from the mirror.

  9. Two mirrors A and B are placed at right angles to each other. A ray of light incident on mirror A at an angle of 25° falls on mirror B after reflection. The angle of reflection for the ray reflected from mirror B would be:
    (a) 25°
    (b) 50°
    (c) 65°
    (d) 115°

  10. Rohit is performing an experiment using a piece of paper marked with a dot and a cross with a black marker, as shown below. He notices that the round mark disappears when he moves the paper close to his face.

    Which of the following conclusion is most likely correct?
    (a) Rohit has a problem with his vision.
    (b) The round mark is not visible because it falls on Rohit’s blind spot.
    (c) The round mark is too small to be seen at close distances.
    (d) The cross marker appears to be clearer because of its shape.

  11. While playing outside, Ravi feels a sharp pain in his eye. What immediate action should he take to protect his eyes?
    (a) Rub his eyes vigorously.
    (b) Rinse his eyes with clean water.
    (c) Ignore the pain and continue playing.
    (d) Cover his eyes with his hands.

  12. In a science experiment, Riya shines a flashlight on a crumpled aluminium foil and observes that the light scatters in different directions. This is an example of:
    (a) Regular reflection
    (b) Diffused refraction
    (c) Dispersion of light
    (d) Diffused reflection

    Subjective Questions

  13. Neha is experiencing eye strain while watching TV in a dark room. What measures can she take to protect her eyes?

  14. Give an example of a rough surface and explain how reflection from this surface differs from reflection from a smooth surface.

  15. Rohit is conducting an experiment with white light and different coloured objects. Can you explain to him what colour an object will appear to be in the following
    cases:
    (i) It reflects all colours.
    (ii) It absorbs all colours.
    (iii) It reflects green light and absorbs other colours.
    (iv) It reflects red light and absorbs other colours.

  16. When you stand in front of a large plane mirror, describe four characteristics of the image it forms.

    Assertion-Reasoning Questions
    Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:


  17. Assertion: Some persons may lose their eyesight because of a disease or an injury.
    Reason: Visually impaired person develops their other senses more sharply.

  18. Assertion: A kaleidoscope uses multiple mirrors to create beautiful patterns.
    Reason: Using repeated reflections, kaleidoscopes create intricate patterns.

  19. Assertion: The irregularities in the reflecting surface, such as that of cardboard, cause irregular reflection.
    Reason: Diffused or irregular reflection occurs when all of the parallel rays reflected from a rough or irregular surface are parallel to each other.

    Case-Based Questions

  20. Ravi and Priya were playing together with a torch. Ravi is fascinated by the human eye and notices that her pupil dilates when he shines a torch in Priya's eye. He decides to experiment to figure out why this is happening.

    Ravi instructs Priya to look straight ahead while he measures the size of her pupil. He then shines a torch into her eye and examines the pupil again. He turns off the torch and returns his attention to the student. When he shines the torch on the eye, he notices that the size of the pupil changes.
    Note: Flashing a torch or flashlight is not recommended as it can cause permanent
    damage to the eye. The question is only meant to be a concept application.
    (a) Both A and R are true, and R is the correct explanation of the assertion.
    (b) Both A and R are true, but R is not the correct explanation of the assertion.
    (c) A is true, but R is false.
    (d) A is false, but R is true.

    Answer the following question based on the given information.
    (a) What is the function of the pupil in the human eye?
    (b) Why does the size of the pupil change when light is shone on the eye?
    (c) In which case was Priya's pupil larger - when the torch was switched on or off? Justify your answer.
    (d) How does the size of the pupil affect the amount of light entering the eye?
    (e) What role does the iris play in controlling the size of the pupil and regulating the amount of light entering the eye?

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