Question

The image produced by a concave mirror is at a distance half the distance of the object. If the object is 0.1m, the focal length of the mirror is 1) 0.1 m 2) 0.02 m 3) 0.01m 4) 0.03m ?​

Answer 1

Answer:

0.03 m is the distance of the focal length of the mirror

Explanation:

u(object distance) = 0.1 m

v(image distance) = 0.05 m

f (focal length) = ?

$\frac{ 1}{f} = \frac{1}{u} + \frac{1}{v}$

$\frac{1}{f} = \frac{1}{0.1} + \frac{1}{0.05}$

$\frac{1}{f} = \frac{1 + 2}{0.1}$

$\frac{1}{f} = \frac{3}{0.1}$

$f = \frac{0.1}{3}$

$f = 0.03m (ans)$