A concave mirror of focal length f produces an image n times the size of object .What would be the object distance for which image is real?
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________ _________
size of image/ size of object =>n
In case of concave mirror ,if image is real then must be inverted
m=>-n =>-v/u
m=>n=>v/u
from mirror formula
____________
1/u+1/v =>1/f
=>1+u/v =>u/f
=>1+1/n =>u/f
u=>(n+1/n)f
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