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Mirror Formula Formal Proof

When an objec...

Question

When an object is placed at a distance of $20$ cm from concave lens, then small image is formed. Then the correct statement will be:

A

Image will be inverted

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B

Image may be real

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C

Image is formed at

20

cm distance

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D

The focal length of the lens may be less than

20

cm

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Solution

The correct option is D The focal length of the lens may be less than $20$ cm
The focal length of the lens may be less than $20 c m .$

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