Question

An object 20 cm high is placed 50 cm from a concave lens whose focal length is 20 cm.

Answer 1

Explanation:

length f=−20 cm

Object distance u=−50 cm

Using

v

1

−

u

1

=

f

1

Or

v

1

−

(−50)

1

=

−20

1

We get v=−14.3 cm

Answer 2

Answer:

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