Question

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المرور
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6. find the focal length of alens of power
-2.0D. what type of lens is this?

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Answer 1

`-(1)/(2)`

Diverging lens

Step-by-step explanation:

Given parameters:

Power of lens = -2.0D

Unknown:

Focal length = ?

Solution:

The power of lens is the reciprocal of the focal length;

P =
`(1)/(f)`

where f is the focal length

f =
`(1)/(P)` =
`-(1)/(2)`

The lens is a diverging lens