Question

A 4.0 cm high object is placed at a distance of 60 cm from a concave lens of focal length 20 cm.Find the position and size of image.

Answer 1

Answer:

here, h=4 cm

u= -60cm

f= -20cm

by using formula,

1/v-1/u=1/f

1/v=1/-20-1/60

1/v= -4/60

v= -15cm

again,

v/u=h`/h

-15/-60=h`/4

=>1/4=h`/4

h`=1 cm..

Explanation:

hope it helps you...