Question

Power of a convex lens is 2D. Its focal length will be:


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Answer 1

Question :-

Power of a convex lens is 2D. Its focal length will be:

Solution :-

Given :

• P = 2D

Need to find :

• Focal length (f)

We know that,

$\sf: \longmapsto{P = \frac{1}{f}}$

Then,

$\sf: \longmapsto{f = \frac{1}{P}}$

Focal length :

$\sf:\longmapsto{}f = \frac{1}{2} \: \: \: \: \: \: \: \\ \\ \bf:\longmapsto \red{f = 50m}</p><p>$

Focal length (f) = 50cm.

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Answer 2

QUESTION :-

Power of a convex lens is 2D. Its focal length will be :-

Given :-

• P = 2D

To Find :-

• Focal length (f) of the lens

SOLUTION :-

We know that,

$\sf \fbox{→P = \frac{1}{f}}$

Then,

$\sf \fbox{→f = \frac{1}{P}}$

$\therefore$ Focal length (f) :-

$\sf{→f = \frac{1}{2}}$

$\sf \fbox \green{→f = 50m}$

Hence the Focal length (f) = 50m.

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