Question

An object is placed at distance of 25cm from a spherical mirror and its image is formed behind the mirror at a distance ofv5cm. Find the focal length. Is it concave or convex mirror

Answer 1

sorry it is the wrong answer sorry.

But it is conformly concave mirror.

Answer 2

Mirror Formula:

$\frac{1}{v} + \frac{1}{u} = \frac{1}{f}$
Where 'v' is distance of the image from the pole, 'u' is distance of the object from the pole and 'f' is the focal length.


$\frac{1}{5} + ( - \frac{1}{25}) = \frac{1}{f} \\ \frac{5 - 1}{25} = \frac{1}{f} \\ f = 6.25cm$


The mirror is convex as focal length of a convex mirror is positive.