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1. A coneave mirror is a part of sphere of radius 40 cm. What is the focallength of the mirror?

Answer»

Ans :- Radius of sphere\curvature =40m

Now, we are already aware of the relation between Radius of the curvature and focal length of the mirrors.

Focal length = half of the radius of the curvature.

i.e f = 1\2 C

So, f= 1/2 ×40

f=20m



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