Class X

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
The change in the focal length of human eye is caused due to
  1. Ciliary muscles
  2. Pupil
  3. Cornea
  4. Iris
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 image formed by retina of human eye is
  1. Virtual and erect
  2. Real and inverted
  3. . Virtual and inverted
  4. Real and erect
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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