Class X

Which of the following optical phenomenon is used in cinematography or movie projectors?
  1. accomodation
  2. persistence of vision
  3. interference
  4. short sightednes
The human eye forms the image of an object at its
  1. cornea
  2. iris
  3. pupil
  4. retina
Which phenomenon is responsible for the twinkling of stars?
  1. Atmosphere reflectio
  2. Atmosphere refraction
  3. Reflection
  4. Total internal reflection
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
The least distance of distinct vision for a young adult with normal vision is about
  1. 25 m
  2. 2.5 cm
  3. 25 cm
  4. 2.5 m
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