Question

find power of convex mirror whose focal length is50cm.​

Answer 1

$\huge\underline\green{\rm Solution:}$

$\large\underline\purple{\rm Given: }$

★ Focal Lenght (f) = 50cm or 0.5m

$\large\underline\purple{\rm To\:Find: }$

★Power of convex lense (P) = ?

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We know ,

$\Large{\boxed{\rm Power (P)={\frac{1}{f}} }}$

$\large\implies{\rm P={\frac{1}{0.5}}}$

$\large{\rm P=+ 2}$

$\large\red{\boxed{\rm Power\:of\:lens=+2dioptre }}$

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NOTE :-

Power of lens for :-

Convex lens is = positive (+)

Concave lens is = negative (-)

Take focal lenght always in meter (m) for calculation of Power of lens

Answer 2

so the power =20D (dioptre)