Reflection And Refraction

17 Questions
Reflection And Refraction

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Questions and Answers
  • 1. 
    A mirror is tilted at an angle of 30o to the bench. A ray of light is directed so that it hits the mirror at an angle of 40o to the surface of the mirror as shown. What is the angle of reflection?
    • A. 

      30 degrees

    • B. 

      40 degrees

    • C. 

      50 degrees

    • D. 

      60 degrees

  • 2. 
    An object is placed in front of a plane mirror as shown. Which point represents the position of the image?
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 3. 
    Which one of the following is not a property of the image of an object placed 12 cm in front of a plane mirror?
    • A. 

      It is behind the mirror and laterally inverted.

    • B. 

      It is 12 cm from the mirror.

    • C. 

      A line joining the top of the image is perpendicular to the plane of the mirror.

    • D. 

      It is real.

  • 4. 
    The diagram shows the image of the face of a clock seen in a plane mirror. What is the correct time?
    • A. 

      3.35

    • B. 

      5:40

    • C. 

      7:20

    • D. 

      8:25

  • 5. 
    Tom is standing beside his friend Jerry in front of a large plane mirror. If both of them are equal distance from the mirror as shown in the diagram, where does Tom saw Jerry’s image?
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 6. 
    A ray of yellow light enters a semi-circular glass block normal to the curved surface. Which of the following correctly shows the partial reflection and refraction of the ray?
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 7. 
    Hermione is running towards an upright plane mirror at a speed of 0.2 m/s. Calculate the speed at which her image is moving towards her.
    • A. 

      0.1 m/s

    • B. 

      0.2 m/s

    • C. 

      0.4 m/s

    • D. 

      0.8 m/s

  • 8. 
    A ray of light is incident upon a plane mirror at an angle of 30°.  The mirror is then turned through 30°with the direction of the ray unchanged.  What is the final value of the angle of reflection?
    • A. 

      15 degrees

    • B. 

      30 degrees

    • C. 

      45 degrees

    • D. 

      60 degrees

  • 9. 
    What affects the refractive index of a sample of glass?
    • A. 

      The angle of incidence

    • B. 

      The thickness of the glass

    • C. 

      The shape of the glass

    • D. 

      The type of glass

  • 10. 
    When viewed normally, a rectangular block of glass appears to be 2.0 cm thick. If the refractive index of the glass is 1.4, find the true thickness of the block.
    • A. 

      0.7 cm

    • B. 

      2.0 cm

    • C. 

      2.8 cm

    • D. 

      5.0 cm

  • 11. 
    A ray of light travels from air into two mediums X and Y before it emerges into air again. Refractive index of medium X is higher than that of medium Y. Which of the following diagrams shows a possible path of this ray?
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 12. 
    A ray of light travels from water into air.  Which arrow correctly shows how the ray of light will refract?
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 13. 
    The following diagram shows the path of a ray of light traveling towards and into a pool of water. Four angles are labeled. Which two angles are the angle of incidence and angle of refraction?
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 14. 
    A swimming pool is lit by a lamp in the bottom of the pool. The directions of three rays from the lamp are shown. Which of the following marked angles is the critical angle for the glass block?
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 15. 
    The critical angle for plastic is 38.7o. Which of the following diagrams does not represent the behaviour of light as it travels from plastics into air?
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 16. 
    The speed of light in air is 3.0 x 108m/s. If the speed of light in material A is 2.5 x 108m/s, calculate the refractive index of material A
    • A. 

      0.833

    • B. 

      1.20

    • C. 

      5.5

    • D. 

      7.5

  • 17. 
    The diagram shows how light travels through the optical fibre of an endoscope used to look into stomach of ulcer patients. X represents the inner material of the optic fibre while Y represents the outer material. Which of the following statements is not true?
    • A. 

      No light is lost through the optical fibre.

    • B. 

      The light in the optical fibre obeys the first law of reflection where the angle of incidence is equal to the angle of reflection.

    • C. 

      The refractive index of X is greater than the refractive index of Y.

    • D. 

      The refractive index of Y is greater than the refractive index of X.