Class X

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
A person cannot see objects clearly beyond 50 cm. The power of lens to correct the vision is
  1. +5 D
  2. -0.5 D
  3. -2 D
  4. +2 D
A small hole in iris which controls the intensity of light entering the eye is called __________.
  1. pupil
  2. cornea
  3. retina
  4. Iris
____________ 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
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