Q8 of 25 Page 11

What do you mean by the power of accommodation of an eye? ( CBSE 2006)

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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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)

 7

Why is a normal eye not able to see clearly the objects placed closer than 25 cm?
( CBSE 2006)

 9

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?
( CBSE 2007)

 10

What is meant by advance sunrise and delayed sunset ? Draw a labelled diagram to explain this phenomenon. ( CBSE 2015, 2010)