Question

An object kept at a distance of 16 cm from the lens gives a virtual image at a distance of 20 cm over the same side of the lens what is the focal length of the lens?​

Answer 1

Answer:

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Explanation:

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Answer 2

Explanation:

From lens formula,

f

1

=

v

1

−

u

1

=

(−20)

1

−

(−60)

1

=−

60

2

⇒f=−30cm

Since the focal length is negative. It is a diverging lens.