Class X

Human is made up of ___________ jelly fluid material and it is a _________ __________ lens.
  1. crystalline, double, convex
  2. retina
  3. cornea
  4. Iris
Which phenomenon is responsible for the twinkling of stars?
  1. Atmosphere reflection
  2. Atmosphere refraction
  3. Reflection
  4. Total internal reflection
________ 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
For a young human adult with normal vision, the near point is about ___________ and it is denoted by ______.
  1. 25 cm, D
  2. retina
  3. cornea
  4. Iris
Which of the following optical phenomenon is used in cinematography or movie projectors?
  1. accomodation
  2. persistence of vision
  3. interference
  4. short sightedness
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