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Question

The image distance of an object placed 10 cm in front of a thin lens of focal length +5 cm is at :

A
6.5 cm
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B
8.0 cm
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C
9.5 cm
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D
10.0 cm
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Solution

The correct option is C 10.0 cm
Given:
The object distance u=10 cm
The focal length of the lens f=+5 cm

From the lens formula,
1f=1v1u

15=1v110

1v=15110=110

v=10 cm

Thus, the distance of the image from the lens is v=10cm and it is on the other side of the lens.

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