PhysicsThe focal length of a convex lens is 25 cm. Find its power.

The focal length of a convex lens is $25 cm$ . Find its power.

A
$+ 10 D$
B
$- 10 D$
C
$+ 4 D$
D
$- 4 D$

Solution:

The focal length of a convex lens is

25 cm

. Its power is

+ 4 D

.
Given that,
Focal length of a convex lens,

f = 25 cm

= 0.25 m

As we know, the power of the lens

P = \frac{1}{f}

⇒

P = \frac{1}{0.25}

⇒

P = + 4 D

(for convex lens)

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