Class X

Which phenomenon is responsible for the twinkling of stars?
  1. Atmosphere reflectio
  2. Atmosphere refraction
  3. Reflection
  4. Total internal reflection
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
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
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
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