Question

An object of 5 cm height is placed at a distance of 15 cm from a concave mirror.Find the height of its image.The focal length of the mirror is 10 cm.

Answer 1

Answer: lens formula

1/v+1/u=1/f

Magnification formula = -v/u=H2/h1

Height of the object is 5 cm

Focal length of the mirror is 10cm

U( object distance)= 15

So by applying the mirror formula her

1/v=1/f-1/u

1/v=1/-10 + 1/15

1/v=-3+2/30

v=-30

As we get the value of v which is -30 we will now apply magnification formula

h'/h=-v/u

h'/5=30/-15

h'=10 cm

Therefore the height of the object is 10 cm