Class X

The change in the focal length of human eye is caused due to
  1. Ciliary muscles
  2. Pupil
  3. Cornea
  4. Iris
The persistence of vision for human eye is
  1. 1/10th of a second
  2. 1/16th of a second
  3. 1/6th of the second
  4. 1/18th of a second
Which of the following colors is least scattered by fog, dust of smoke?
  1. Violet
  2. Blue
  3. Red
  4. Yellow
The light sensitive cell present on retina and is sensitive to the intensity of light is:
  1. cones
  2. rods
  3. both a and b
  4. None of these
The part of the eyes refracts light entering the eye from external objects?
  1. Lens
  2. Cornea
  3. Iris
  4. Pupil
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