Question

Define power of lens and relation between focal length

Answer 1

Power of lens is the ability of thelens to converge the rays of light falling on it. 

relation :
P=1/f
where P = power of lens
and f = focal length

Answer 2

✨✔️✔ ️HERE IS YOUR ANSWER...

✔ ️The power of lens is defined as the reciprocal of its focal length.

✔️ It is represented by the letter “P”.

✔ ️$p = \frac{1}{f}$

✔️ The SI unit of power of lens is “dioptre”.
• It is denoted by the letter “D”.
• 1 D is the power of a lens whose focal length is 1m.

✔️ Power of a convex lens is positive.

✔️ Power of a concave lens is negative.

✨✔️✔️ HOPE IT HELPS YOU....
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