Question

find a focal legth of a convex mirror whose radius of culvature is 30 cm​

Answer 1

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Given that,

There is a convex mirror.

Also, given that,

Radius of curvature, r = 30cm

To find the focal length.

Let the required focal length be f.

But, we know that,

r = 2f

Therefore, we will get,

f = r/2

Substituting the value of r,

Therefore, we will get,

f = 30/2

f = 15

Hence, the required focal length is 15 cm.

Answer 2

Answer:

Radius of curvature(R)=30

Focal length(f)=?

we know that,

f=R/2

f=30/2

f=15cm

This is the required answer you need.

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