Class X

The phenomena of light responsible for the working of the human eye is
  1. Reflection
  2. Refraction
  3. Power of accommodation
  4. Persistence of vision
The colored light that refracts most while passing through a prism is
  1. Yellow
  2. Violet
  3. Blue
  4. Red
The colored light that refracts most while passing through a prism is
  1. Yellow
  2. Violet
  3. Blue
  4. Red
The least distance of distinct vision for a young adult with normal vision is
  1. 25 m
  2. 20 m
  3. 25 cm
  4. 20 cm
Which of the following colors is least scattered by fog, dust of smoke?
  1. Violet
  2. Blue
  3. Red
  4. Yellow
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