Question

A convex mirror produces a magnification of 1/2 when an object is placed at a distance of 60 cm in front of it. Where should the object be placed, so that the size of the image becomes 1/3 of that of the object?

Answer 1

my answ3r is -90 cm.............
plzz mark it as a brainliest answer........

Answer 2

Answer:The object should be placed in front of the mirror,at a distance of 120cm.

Explanation:

m=+1/2

U=-60cm

So, -v/u = +1/2

Or v= -u/2=-(-60)/2=30cm

1/f=1/v+1/u=1/30-1/60=(2-1)/60=1/60

Implies that f=60cm

Now,m=+1/3

-v/u=1/3

-v=u/3

v=-u/3

1/f=1/v+1/u

1/60=1/(-u/3)+1/u=-3/u+1/u=(-3+1)/u=-2/u

Implies that u=-2*60=-120cm.