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Question
A convex lens of focal length 8 cm forms a real image of the same size as the object. The distance between object and its image will be:
Options
8 cm
16 cm
24 cm
32 cm
MCQ
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Solution
32 cm
Explanation:
A convex lens forms a real image at 2f on the right side of the lens. The size of the image is equal to that of the object if the object is placed at 2f.
∴ Distance between the image and the object = 2f + 2f
= 4f
= 4 × 8
= 32 cm
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