Science, asked by emetttt, 1 year ago

what is the focal length of the lens with power minus 5.5 dioptres

Answers

Answered by apparagarwal789
3

Power = 1 / focal length ( in metre)

So, - 5.5 D = 1 / f

f = - 1 / 5.5 m

f = - 10 / 55 m

f = - 0.18 m = - 18 cm.

It is a concave lens of focal length 18 cm .

Answered by hamdanhana2005
1

Answer:-0.18 m = - 18 cm

Explanation:

Power = 1 / focal length ( in metre)

So, - 5.5 D = 1 / f

f = - 1 / 5.5 m

f = - 10 / 55 m

f = - 0.18 m = - 18 cm.

It is a concave lens of focal length 18 cm

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