Class X

The least distance of distinct vision for a young adult with normal vision is
  1. 25m
  2. 20m
  3. 25cm
  4. 20cm
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
What is the time difference between actual sunset and apparent sunset?
  1. 2 s
  2. 20 s
  3. 2 minute
  4. 20 minute
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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