Q16 of 284 Page 261

What is the nature of a lens having a power of + 0.5 D ?

nature of a lens having a power of + 0.5 D is Convex lens


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14

The power of a lens is + 0.2 D. Calculate its focal length.

 15

The power of a lens is, - 2 D. What is its focal length ?

 17

What is the nature of a lens whose power is,- 4 D?

 18

The optician's prescription for a spectacle lens is marked+ 0.5 D. What is the: (a) nature of spectacle lens?

(b) focal length of spectacle lens ?