Class VIII

Which of the following part of eye controls the amount of light entering the eye by contracting or dilating?
  1. Retina
  2. Cornea
  3. Pupil
  4. Iris
Band of colored light which make up white light is called
  1. spectrum of light
  2. band of ligh
  3. rainbow
  4. white light colors
Image formed by the plane mirror is:
  1. Always real
  2. Always virtual
  3. Sometimes real sometimes virtual
  4. None of these
A snail crawls at speed of
  1. 1.7 m/s
  2. 0.03 m /s
  3. 25m/s
  4. 10m/s
Ray which is striking surface is
  1. normal ray
  2. incident ray
  3. reflected ray
  4. all of them
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