Class X

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
Which of the following are the primary colours?
  1. Red, Blue, Yellow
  2. Red, Green, Violet
  3. Yellow, Green Blue
  4. Red, Green, Blue
The human eye forms the image of an object at its
  1. cornea
  2. iris
  3. pupil
  4. retina
When light passes through a prism, the colour which deviates the least is
  1. red
  2. blue
  3. violet
  4. green
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