Class X

The image formed by retina of human eye is
  1. Virtual and erect
  2. Real and inverted
  3. Virtual and inverted
  4. Real and erect
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
Which of the following optical phenomenon is used in cinematography or movie projectors?
  1. accomodation
  2. persistence of vision
  3. interference
  4. short sightednes
When light passes through a prism, the colour which deviates the least is
  1. red
  2. blue
  3. violet
  4. green
What is the time difference between actual sunset and apparent sunset?
  1. 2 s
  2. 20 s
  3. 2 minute
  4. 20 minute
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