Question

when an object is kept at 60cm from the lens,its image is formed at 30cm from it.Find the focal length of the lens.Also find the magnification.​

Answer 1

Answer:

From lens formula,

f

1

=

v

1

−

u

1

=

(−20)

1

−

(−60)

1

=−

60

2

⇒f=−30cm

Explanation:

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