Class X

A small hole in iris which controls the intensity of light entering the eye is called __________.
  1. pupil
  2. cornea
  3. retina
  4. Iris
________ occurs due to weakening of ciliary muscles in old age. It can be corrected by using __________ lenses.
  1. Iris
  2. retina
  3. cornea
  4. Presbyopia, bi-focal
____________ muscles hold the position of the lens and adjust its thickness.
  1. Cilliary
  2. pupil
  3. retina
  4. Iris
Human is made up of ___________ jelly fluid material and it is a _________ __________ lens.
  1. crystalline, double, convex
  2. retina
  3. cornea
  4. Iris
. Power of a spherical lens is the reciprocal value of its _______________.
  1. focal length
  2. retina
  3. cornea
  4. Iris
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