Question

A concave mirror produces three times enlarged image of an object placed at 10 cm in front of it. Calculate the focal length of the mirror.​

Answer 1

Explanation:

Given,

Magnification, m=3

Object distance, u=10cm

We know,

Magnification, m=−

u

v

3=

−10

−v

⇒ v=30cm

From mirror formula,

f

1

=

v

1

+

u

1

f

1

=

30

1

−

10

1

=

30×10

10−30

=

300

−20

f=−15cm

Focal length, f=−15cm

Answer 2

Answer:

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