Question

state and define the S.I. unit of power of a lens

Answer 1

The power of the lens is dioptre denoted by the letter D. If f is expressed in meters theb power is expressed in dioptres. 1 dioptre is the power of the lens whose focal length is 1m. Power of a concave lens is negative and convex lens is positive

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.
• 1D = 1m

✨✔️✔️ HOPE IT HELPS YOU....
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