Q1 of 13 Page 411

What is the least distance of distinct vision of a normal human eye?

The least distance of distinct vision of a normal human eye is 25 cm, it means that an adult person with normal eyesight can view objects distinctly at a distance of 25 cm from the eye and if we reduce the distance between the object and eye than this, then the vision will become blurry and will experience headache.


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2

State two properties of the image formed by the eye lens on the retina.

 3

A person is advised to wear spectacles with concave lenses. What type of defect of vision is he suffering from?

 4

A person can comfortably read a book but finds it difficult to read the number on a bus parked 5 m away from him. Name the type of defect of vision he is suffering from. Which type of lens should be used in his spectacles to correct his vision?

 5

Name the atmospheric phenomenon due to which the sun can be seen above the horizon about two minutes before actual sunrise.