Question

A man uses a concave mirror for shaving; the focal length of the mirror is
50 cm. How distance should his face be to form a twice magnified image,
explain your result?

help me please!​

Answer 1

Answer:

not now this dear sorryyyyyyyyyyyyyyy

Answer 2

Answer:

Let the distance of man from mirror = u

Let the distance of image from mirror = v

Given: v = 2u

As we know:

$\frac{1}{f} = \frac{1}{v} - \frac{1}{ - u} \\ \frac{1}{50} = \frac{1}{2u} - \frac{1}{ - u} \\ \frac{1}{50} = \frac{1}{2u} + \frac{ 1}{u} \\ \frac{1}{50} = \frac{1 + 2}{2u} \\ \frac{1}{50} = \frac{3}{2u} \\ 2u = 150 \\ u = \frac{150}{2} \\ u = 75$

So the distance should be 75 cm.

Explanation:

Hope it helps u :)