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Question

An object (O) is placed in front of a concave mirror at some distance as shown in the diagram above. Identify which of the following options best describes the image formed by the mirror?
480784.jpg

A
Virtual and magnified
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B
Real and erect
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C
Inverted and magnified
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D
Virtual and reduced
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E
Real and inverted
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Solution

The correct option is E Real and inverted


According to sign convention , the distance of object from the pole of lens is negative (u) and given that u>R.

Now by 1u+1v=2R

or v=uR2uR

but u>R it means that v will be negative (when we put the signs of u and R ) and v<R. v will have a value between R and R/2 .

Now magnification m=vu=<1 (because v<R and u>R)

it means inverted and smaller image

As v is negative ,a real ,inverted and smaller image of the object will be formed between focus (R/2) and R.


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