Question

an object of height 2 cm is held at a distance of 40cm in front of a concave lens of power -5d find the size of the image

Answer 1

Explanation:

we put lens formula and get v=-5.71...

then m=hi/ho

m=-5.71/40

then

m=hi/ho=v/u

hi/2=-5.71/40

40hi=-11.42

hi= -0.2855

size of images is-0.2855

hi is less than ho