Question

the object distance of a lens is -30 cm and image distance is - 10cm.find the magnification of the lens. decide whether the size of the image is smaller or bigger than the size of the object​

Answer 1

Answer:

u = -30 cm

v = -10 cm

The Formula for magnification of the lens = v/u

Hence, m = -30/-10 = 3

So, the magnification of the lens is 3.

Next, we know that the magnification of lens can also be written as = h'/h

Hence, h'/h = 3

Therefore, h' = 3h

By this, we can conclude that the image size will be 3 times bigger than the object size.

$\rule{200}2$

Magnification = m = v/u = h'/h

$\rule{200}2$