Question

concave mirror produces three times enlarged image of an object place +10 front of it
Calculate the focal length of the mirror
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Answer 1

Answer:

Focal length (f)-15/2(7.5)cm.

Explanation: given that:-

u=+10,and v=3×10=+30

f=?

We know that-

1/f=1/u+1/v.

Then putting the value of u and v-

1/f=1/10+1/30

1/f=3+1/30

1/f=4/30

1/f=2/15

Then,f=15/2.