Question

Define I dioptre of power of a lens.

Answer 1

✨✔️✔ ️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.

✨✔️✔️ HOPE IT HELPS YOU....
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Answer 2

Dear Student,

◆ One Dioptre -

• Dioptre is the unit of power of lens.
• 1 Dioptre is the power of a lens for which focal length is 1 m.

● Explaination -

• Power of the lens is reciprocal of focal length in metres.
• Power of the lens is calculated as -

Power (in D) = 1 / focal length (in m)

• Power of concave lens is negative and convex lens is positive.

Thanks dear. Hope this helps you...