Question

the power of a lens is -2 dioptre what is the focal length of a lens​

Answer 1

HEre Is Your Ans ⤵

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$=> p = \frac{1}{f} \\ \\ => f = \frac{1}{p} \\ \\ = > f = \frac{1}{ - 2} \\ \\ = > \: f = - \: 0.5$

Hence , Focal Length Of lens Is

$\fbox{ - 0.5}$

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Hope It helps U

Answer 2

Answer: -0.5 m

Explanation:

According to the formula,

Power = 1/ focal length

Therefore, focal length = 1/ power

f = 1/ (-2)

f = -0.5

Thus, focal length = -0.5 m