Question

an object kept at a distance of 25 cm from a concave mirror of focal length 20cm. calculate the magnification , if the images real​

Answer 1

Given,

Object distance, u=25cm

Focal length, f=20cm

From mirror formula

f

1

=

v

1

+

u

1

−20

1

=

v

1

−

25

1

⇒

v

1

=−

20

1

+

25

1

v=100cm

The image will be real, inverted magnified

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Answer 2

therefore v= 70....

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