Question

A convex mirror forms an image one-fourth the size of the object. If object is at a distance of 0.5 m from the mirror, then focal length of mirror is +0.16 m –1.5 m +0.14 m –0.4 m

Answer 1

Answer Option a

Given:

u=(-0.5)

m=1/4

To find:

Focal length

Solution:

$m = \frac{ - v}{u}$

$\frac{1}{4} = - \frac{ - v}{ - 0.5}$

v=1/8m

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

$\frac{1}{f} = 8 </em><em>-</em><em> 2$

$f = </em><em>1</em><em>/</em><em>6</em><em>$

Or 160 cm or 0.16m

Hope it helps!!