Question

two concave mirrors A and B are made from two spheres of radii 30cm and 32cm respectively. which of the two concave mirrors will have larger focal lenght? what will be the focal lenght of A and B?

Answer 1

mirror B will have larger focal length.

Focal length of a is 15

focal length of b is 16

Answer 2

Hey mate..

From the data,

Radius of curvature of mirror A=30 cm
Radius of curvature of mirror B =32cm

So..

Focal length of A=R/2 =30/2
= - 15cm

Focal length of B =R/2 =32/2
= - 16cm

-ve as they are concave mirrors.

So B will have more focal length.


Hope this helps you..

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