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Question

An object is placed at 30 cm in front of the convex lens of focal length 10 cm. Find out the image distance from lens?


A

10 cm

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B

+20 cm

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C

+15 cm

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D

25 cm

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Solution

The correct option is C

+15 cm


Given:
Object distance, u=30 cm
Focal length, f=10 cm (According to sign conventions)
Let image distance be =v
From lens formula,
1v1u=1f
1v(130)=110
1v+130=110
1v=110130=+230
v=+15 cm
Real, inverted and diminished image is formed.


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