Question

A person is in a room whose ceiling and two adjacent walls are mirrors. How many images are formed

• A. 5
• B. 6
• C. 7
• D. 8

Answer 1

Answer: (C)

7

Answer 2

The walls will act as two mirrors inclined to each other at 90⁰ and so sill form $\frac { 360 } { 90 } - 1 = 3$ images of the person. Now these images with object (Person) will act as objects for the ceiling mirror and so ceiling will form 4 images as shown. Therefore total number of images formed = 3 + 4 = 7

Note: The person will see only six images of himself $\left( I _ { 1 } , I _ { 2 } , I _ { 3 } , I _ { 1 } ^ { \prime } , I _ { 2 } ^ { \prime } , I _ { 3 } ^ { \prime } \right)$