Q11 of 70 Page 11

What is meant by the power of accommodation of the eye?

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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9

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 dioptres. What is the focal length of the lens required for correcting

(i) distant vision, and

(ii) near vision?

 10

Why is a normal eye not able to see clearly the objects placed closer than 25 cm?

 12

A narrow beam of light produces a spectrum XY on passing through a triangular glass prism.


(a) State the colour at X and Y.


(b) Why do the different components of white light bend through different angles with respect to the incident beam of light?

 13

Name the defect of vision caused by

(i) Excessive curvature of cornea


(ii) Power of accommodation of eye decreases.