1.

Focal length of a convex lens is 25 cm. Its power is

Answer»

`+4` D
`-4` D
`-0.4` D
`+0.4` D

SOLUTION :`because` Focal length of convex lens f = + 25 CM = + 0.25 cm
`THEREFORE` POWER of convex lens `P = (1)/(f) = (1)/((+0.25 m)) = +4 D`


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