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Explain the working of isosceles prism …

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Explain the working of isosceles prism and Optical Fibre

Posted by Neha Pachani 6 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Nivetha Vijayakumar 6 years, 3 months ago

Optical Fibres: This also uses TIR. Here the refractive index of the core must be higher than that of cladding. So, when the signal in the form of light is directed from one end at a suitable angle, it undergoes repeated TIR and comes out from the other end. Therefore, no absorption of light takes place. (Core refers to the inner space of the tube, cladding refers to the material of the outer coating) Uses: Transmitting electrical & optical signals, decorative lamps, etc.

Nivetha Vijayakumar 6 years, 3 months ago

Right angled isoceles prism: These prism turn the light by 90°or 180°. They are based on the phenomenon of total internal reflection of light. The refractive index for glass is 1.5, therefore the critical angle for glass - air interface is 42° (as refractive index = 1/sin ic). When the angle of incidence is > 42°, for example, 45° the total internal reflection takes place. Uses: to invert the image without changing the size(TIR).

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