# An object of length #2cm# is placed at a distance of #2.5*f# from a concave mirror where f is its focal length. what is the length of the IMAGE?

##
length is provided and not the hieght.just need the length of image. PLease as fast as possible.

length is provided and not the hieght.just need the length of image. PLease as fast as possible.

##### 1 Answer

Nov 12, 2016

The conjugate foci relation of spherical mirror is

#1/v+1/u=1/f......(1)#

Where

So inserting the values in equation (1)

#1/v-1/(2.5f)=-1/f#

Negative means real and inverted image

Now Magnification

So