Question

A pencil of length 5 cm is kept vertical at a distance of 10 cm from a plane mirror. This pencil is then replaced
by another pencil of length twice than that of the earlier one.
What is the distance of the image of this new pencil from the mirror?​

Answer 1

Answer:

15 cm

Explanation:

Length of pencil before = 5 cm

Distance between the pencil and the mirror before = 10 cm

Now , length of the pencil = (5 × 2) cm = 10 cm

Therefore , new distance between the pencil and the mirror now = (10 - 5) cm = 5 cm + 10 cm = 15 cm

Answer 2

Answer:

15 cm

Explanation:

Length of pencil before = 5 cm

Distance between the pencil and the mirror before = 10 cm

Now , length of the pencil = (5 × 2) cm = 10 cm

Therefore , new distance between the pencil and the mirror now = (10 - 5) cm = 5 cm + 10 cm = 15 cm