Q3 of 284 Page 261

Name the physical quantity whose unit is dioptre.

Power of a lens has unit as dioptre.


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1

The lens A has a focal length of 25 cm whereas another lens B has a focal length of 60 cm. Giving reason state, which lens has more power : A or B.

 2

Which causes more bending (or more refraction) of light rays passing through it : a convex lens of long focal length or a convex lens of short focal length ?

 4

Define 1 dioptre power of a lens.

 5

Which type of lens has (a) a positive power, and (b) a negative power ?