Question

# You are given two lenses, a converging lens with focal length + 10 cm and a diverging lens with focal length -20 cm. Which of the following would produce a real image that is smaller than the object?

A
Placing the object 5 cm from the converging lens
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B
Placing the object 15 cm from the converging lens
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C
Placing the object 25 cm from the converging lens
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D
Placing the object 15 cm from the diverging lens
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Solution

## The correct option is C Placing the object 25 cm from the converging lensWhen the object is placed beyond the center of curvature of a converging lens, a real and diminished image is formed between the focus and the center of curvature.The focal length of the converging lens is +10 cmThe radius of curvature of the converging lens is 2f=+20 cmThus, the object must be placed beyond 20 cm or at 25 cm.

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