Question

Periscope works on the principle of multiple reflections. It consists of two or more mirror, used for the reflection. If the two mirrors are placed at an angle of 90°, how many images of the object are formed between them? a)one b) Two c) Three d) Four

Answer 1

Answer:

the answer would be 3 images

Answer 2

Given:

Angle between two mirrors = 90°

To Find: Images formed between the mirrors

Calculation:

• When two mirrors are placed at some angle, then the number of images formed are multiple i.e. more than one.
• The number of images (n) formed is given as = $\frac{360}{\alpha }$, where α is the angle made by two mirrors.
• So, number of images = $\frac{360}{90} = 4$

Answer:

d) Four images are formed between both mirrors.