Question

- Find the power of concane lense of foca
length 2m?​

Answer 1

Answer:

0.5D

Explanation:

POWER : It is the reciprocal of the focal length in metre.   $\frac{1}{f}$

here focal length is 2m.

please note that if the focal length is given in cm convert it to metre.

so here power = $\frac{1}{2}$ = 0.5

SI unit is Dioptre (D)

so power = 0.5D

Answer 2

Answer:

the answer is 0.5d

Explanation:

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