Question

the focal length of a diverging lens is 20 cm. calculate the power of the lens.

Answer 1

◼ TASK : POWER OF THE LENS
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⏩ FOCAL LENGTH = 20 cm =
0.2 m

⏩ POWER OF LENS = 1 / FOCAL LENGTH

⏩ POWER OF LENS = 1 / - 0.2

⏩ POWER OF LENS = - 5 D
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⏩ HOPE IT HELPS

⏩ HAVE A NICE DAY MY FRIEND

Answer 2

Hi.

Here is your answer---

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Given---

Focal length = 20 cm.

Using the Formula,

Power of the Lens = 100/Focal Length in cm.
                              = 100/20
                              = 5 D

Since the lens is diverging, the Power of the Lens will be negative i.e., - 5 Diopter.


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Hope it helps.

Have a nice day.