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A diverging lens has focal length of 3 cm. Calculate the power.

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Question

A diverging lens has focal length of 3 cm. Calculate the power. 

Numerical
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Solution

Given: f = −3 cm = −0.03 m (Diverging lens)

Formula: Power (P) = `1/f` 

∴ P = `1/(-0.03)` 

= `100/-3`

= −33.33 D

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Chapter 2: Refraction of Light - Exercise 7 [Page 131]

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Lakhmir Singh Physics [English] Class 10
Chapter 2 Refraction of Light
Exercise 7 | Q 13. | Page 131
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