Class X

The change in focal length of an eye lens is caused by the action of the
  1. pupil
  2. retina
  3. ciliary muscles
  4. iris
A transparent alkaline liquid between cornea and lens is called ___________. It helps in ________ of light rays in cornea
  1. : aqueous humour, refraction
  2. retina
  3. cornea
  4. Blind Spot
When light passes through a prism, the colour which deviates the least is:
  1. red
  2. blue
  3. violet
  4. green
_______ is the surface which acts as screen and image is formed on it.
  1. Iris
  2. cornea
  3. retina
  4. Blind Spot
. Power of a spherical lens is the reciprocal value of its _______________.
  1. focal length
  2. retina
  3. cornea
  4. Iris
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