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>>Combination of Mirror and Lenses
>> $A point light source is kept in front of$

Question

A point light source is kept in front of a convex mirror ata distance of $40 c m$ . The focal length of the mirror is $40 c m$ . Find the position of image.

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Solution

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Object distance   $u = - 40 c m$
Focal length   $f = 40 c m$
Using mirror formula :   $\frac{1}{v} + \frac{1}{u} = \frac{1}{f}$
Or    $\frac{1}{v} + \frac{1}{( - 4 0 )} = \frac{1}{( 4 0 )}$
We get   $v = 20 c m$

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