Question

A candle is placed at 12 cm in front of a convex mirror. When the convex mirror is replaced with a plane mirror, the image moves 8.5 cm further away from the mirror. Find the focal length of the convex mirror.

Answer 1

u=-12cm
v= 12-8.5= -3.5cm

1/f= 1/v+1/u
1/f= 1/-3.5 +1/-12
1/f= -12-3.5/42
1/f=-15.5/42
f=42/-15.5
f=-2.70

therefore the focal length of convex mirror is -2.70
pls. mark it as brainliest!!