APPLICATION TOTAL INTERNAL REFLECTION.pptx

SHOWS THE APPLICATIONS OF TIR

1. REFRACTION OF LIGHT ARCHA S R BEd Physical Science

2. TOTAL INTERNAL REFLECTION APPLICATIONS

3. 1. REFLECTOR

4. A large number of small prisms are fixed inside a reflector The light ray is incident normally on the side PQ. Hence there is no refraction. We know that the critical angle of glass is 42 but here the angle of incidence at A and B is 45. Hence the light falling on A undergoes total internal reflection again and comes out of the reflector. This process happens in all other prisms in the reflector.

5. 2. Periscope

6. Periscopes are made using mirrors or prisms. Periscopes with prisms make use of the principle of total internal reflection. Two prisms are placed at the two corners at 45 .light rays from 1 st prism undergo total internal reflection. The reflected rays from the second prism reach our eyes and we can see the object.

7. 3.Optical fibre

8. It consists of a core surrounded by a cladding layer. Uses WIDELY USED IN TELECOMMUNICATIONS. Communication signals (optical signals) can also travel through optical fibres in the form of light rays. Thousands of optical signals can be sent simultaneously through a single cable without the loss of intensity. Such signals can be sent to distant places with the speed of light. This is the reason for using optical fibre cables in communication.

9. 2. IN MEDICAL FIELD In medical instruments Endoscope to view the internal part of the body.

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