Question

an object is placed in front of a convex mirror at a distance 20 cm and its image is formed behind the mirror at a distance of 10cm find focal length of the mirror​

Answer 1

Answer:

THE FOCAL LENGTH IS 20/3 THAT IS 6.67cm

Explanation:

THE IMAGE DISTANCE IS 10cm AND OBJECT DISTANCE IS -20cm.

THE SIMPLY APPLY THE FORMULA

1/f = 1/v - 1/u

AND U WILL GET THE ANSWER AS 6.67.

HOPE IT HELPS YOU.

Answer 2

Answer:

Data:-

Distance of an object=20cm

Image behind mirror=10cm

Focal length=?

Formula:-

1/f=1/p+1/q

1/20+1/10=0.15 is answer.