Question

# An object is placed 30 cm in front of a convex lens of focal length 10 cm. Find out the distance of the image from the lens and its nature? Assume the object distance to be negative.

A
15 cm, Real and Inverted
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B
+15 cm, Real and Inverted
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C
15 cm, Virtual and Erect
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D
+15 cm, Virtual and Erect
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Solution

## The correct option is B +15 cm, Real and InvertedGiven: Object Distance, u=−30 cm The focal length of the lens, f=10 cm Focal length is positive for convex lens. Using Len's formula, 1v−1u=1f 1v+130=110 1v=110−130 v=+15 cm So, the distance of the image from the lens is 15 cm. Since, the object is placed beyond the focus, nature of the image is real and inverted.

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