Q3 of 13 Page 411

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

Concave lens also called as diverging lens is used in the type of defects in which the eye is unable to see nearby objects because of the image formation in front of the retina rather than on the retina, hence the defect is Myopia or near sightedness.


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1

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

 2

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

 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?

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