Question

Two plane mirrors and are placed parallel to each other 20 cm apart. A luminous point object is placed between them at 5 cm from as shown in figure
Phy - 2014 P - 1(Q-1).jpgTwo plane mirrors and are placed parallel to each other 20 cm apart. A luminous point object is placed between them at 5 cm from as shown in figure
Phy - 2014 P - 1(Q-1).jpg

Answer 1

Answer:

Given: Two plane mirrors placed at 20 cm apart. A luminous point is placed between them at a distance 5 cm from one mirror.

To find the distances of the first nearest images from each other.

Solution:

As the point is placed at distance 5 cm from one mirror, the first image formed by first mirror at a distance of 5 cm.

As the luminous point is 5 cm from one mirror it will be at a distance of 15 cm from other mirror. Hence the first image formed by second mirror will be formed behind the second mirror at a distance of 15 cm.

Hence the the distances of the first nearest images from each other will be 40 cm (15+15+5+5 = 40 cm), as shown in above figure.

solution