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The magnificationof the image when an ob...

The magnificationof the image when an object is placed at a distance x from the principle focus of a mirror of focal length f is

A

`(f+x)//f`

B

`f//x`

C

`x//f`

D

`f//(f + x)`

Text Solution

Verified by Experts

The correct Answer is:
B
`u = f + x`
Using mirror formula,
`1//v + 1//u = 1//f`
or `1//v - 1//(f + x) = -1//f`
`therefore v = - f(f + x)//x`
So, the magnification = `[m] = v//u = f//x `
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