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Class 10 Science Medium Mcq English Medium

A concave lens has a focal length of 15 cm. At what object distance should it be placed to form an image at 10 cm from the lens (as in Example 9.3)?

Question
A concave lens has a focal length of 15 cm. At what object distance should it be placed to form an image at 10 cm from the lens (as in Example 9.3)?
10 cm
15 cm
20 cm
30 cm
Answer
30 cm
Detailed Explanation
As calculated in Example 9.3, the object distance works out to u = -30 cm, i.e., 30 cm from the lens.
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