Question

A 142 cm tall person stands

Answer 1

Answer:

Height of the image is 9.06 cm

Explanation:

As we know that the person is standing 250 cm from the lens

Now we know that the focal length of the lens is

f = 15 cm

now by lens formula we have

$\frac{1}{f} = \frac{1}{d_i} + \frac{1}{d_o}$

$\frac{1}{15} = \frac{1}{d_i} + \frac{1}{250}$

$d_i = 15.96 cm$

now we know by the formula of magnification

$\frac{h_i}{h_o} = \frac{15.96}{250}$

now we have

$h_o = 142 cm$

$h_i = 142\times \frac{15.96}{250}$

$h_i = 9.06 cm$