Q4 of 284 Page 261

Define 1 dioptre power of a lens.

1 diopter is the power of a lens whose focal length is 1 metre.


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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 ?

 3

Name the physical quantity whose unit is dioptre.

 5

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

 6

Which of the two has a greater power: a lens of short focal length or a lens of large focal length ?