Q1 of 25 Page 11

What are the far point and near point of the human eye with normal vision? 
(CBSE 2009)

The ability of an eye to focus the distant objects as well as the nearby objects and forming the images on the retina by changing the focal length of the eye lens is called accommodation.

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3

Name the:

a. Component of white light that deviates the least.


b. Component of white light that deviates the most, while passing through a glass prism. ( CBSE 2005)

 4

A person suffering from an eye defect uses lenses of power – 1D. Name the defect he is suffering from and the nature of lens used. ( CBSE 2015)

 5

Why does the sky appear dark instead of blue to an astronomer? ( CBSE 2016)

 6

A person needs a lens of power –5.5 dioptres for correcting his distant vision. For correcting his near vision, he needs a lens of power +1.5 dioptre.

What is the focal length of the lens required for correcting


(i) distant vision, and (ii) near vision. ( CBSE 2007)