Question

15. Calculate the power of a convex lens of focal length of 50cm?​

Answer 1

Answer:

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Given,

Focal Length = 50cm = +0.5m

● Power of a lens

$= \frac{1}{f}$

$= \frac{1}{ + 0.5}$

$= + 2 \: m$

Therefore, power of the lens is +2 m.

Answer 2

Answer:

• Power of lens = +2D.

Explanation:

Given:

• Focal length of convex lens = 50 cm = 0.5 m

To Find:

• Power of lens.

First of all What is power of lens?

• Power of a lens is defined as the reciprocal of focal-length.
• Its SI unit is Diopter, (D).
• Power = 1/F

Now, we will calculate power of lens,

$\implies \sf Power\;of\;lens=\dfrac{1}{F}\\ \\ \\ \implies \sf Power\;of\;lens = \dfrac{1}{0.5}\\ \\ \\ \implies \sf Power\;of\;lens = +2\;D$

Hence, Power of lens = +2D.