Class X

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
. Power of a spherical lens is the reciprocal value of its _______________.
  1. focal length
  2. retina
  3. cornea
  4. Iris
In __________ distant objects are not clearly visible. It is corrected by using ________ lens.
  1. myopia, concave
  2. cornea
  3. retina
  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
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