Class X

The transparent spherical membrane covering the front of the eye is called ____________.
  1. cornea
  2. retina
  3. Blind Spot
  4. Iris
By which optical phenomenon, the splitting of white light into seven constituent colours occur?
  1. Refraction
  2. Reflection
  3. Dispersion
  4. Interference
________ 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
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 human eye can focus on objects at different distances by adjusting the focal length of the eye lens. This phenomenon is due to:
  1. near sightedness
  2. long sightedness
  3. accomodation
  4. persistence of vision
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