Class X

When we enter a cinema hall, we cannot see properly for a short time. This is because-
  1. Pupil does notopen      
  2. Pupil does not close
  3. Adjustment of size of pupil takes some time   
  4. None of these above   
Aconcave lensof suitable focal length is used for correcting a-
  1. Myopic eye
  2. Hypermetropic eye
  3. Both a and b
  4. nor a nor b   
Variable focal length of eye is responsible for-
  1. Accommodationof eye
  2. Persistence of vision
  3. Colour blindness
  4. Leastdistanceof distinct vision
The broad wavelength range of visible spectrum is-
  1. 4000-8000A      
  2. 2000-4000A      
  3. 10000-20000A 
  4. None of the above   
Red colour of the sun at the time of sunrise and sunset is because-
  1. Red colour is least scattered    
  2. Blue colour is least scattered
  3. Red colour is scattered the most      
  4. All colours are equally scattered
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