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Ray Optics Test - 6

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Ray Optics Test - 6
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  • Question 1
    4 / -1
    A concave lens of focal length 20 cm placed in contact with a plane mirror acts as a convex mirror of focal length
    Solution

  • Question 2
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    An object is placed at a distance 20 cm from the pole of a convex mirror of focal length 20 cm. The image is produced at
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  • Question 3
    4 / -1
    Which mirror is to be used to obtain a parallel beam of light from a small lamp?
  • Question 4
    4 / -1
    If two mirrors are kept at 60° to each other, then the number of images formed by them is
  • Question 5
    4 / -1
    Transmission of light to large distances through optical fibres is based on
  • Question 6
    4 / -1
    Critical angle of light passing from glass of water is minimum for
  • Question 7
    4 / -1
    The critical angle of the medium with respect to vacuum is 30°. If the velocity of light in vacuum is 3 × 108 ms-1, the velocity of light in medium is
    Solution

  • Question 8
    4 / -1
    The instrument used by doctors for endoscopy works on the principle of
  • Question 9
    4 / -1
    If sound travelling at 340 ms-1 enters water where its speed becomes 1480 ms-1, then critical angle for total internal reflection is
    Solution

  • Question 10
    4 / -1
    The earth radiates in the infra-red region of the spectrum. The spectrum is correctly given by
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