TOTAL INTERNAL REFLECTION PHENOMENON....
- 1. REFRACTION OF LIGHT ARCHA S R BEd Physical Science
- 3. Have you had such an experience?
- 5. When a ray of light enters from an optically denser medium to a rarer medium, the angle of incidence at which the angle of refraction becomes 90 is the Critical angle. in the glass-air pair, the critical angle is 42
- 6. TOTAL INTERNAL REFLECTION •When a ray of light enters from an optically denser medium to a rarer medium, at an angle of incidence greater than the critical angle, the ray is reflected back completely to the same medium without undergoing refraction. This phenomenon is total internal refraction.
- 8. 1. The bottom of the aquarium is seen above the surface of water. What may be the reason? The light coming from the bottom of the aquarium undergoes total internal reflection at the surface of water.
- 10. • One end of each optical fibre in the decorative lamp is connected to a suitable source of light. • Light rays from this source travels through the fibre. While travelling through the fibre rays make an angle of incidence greater than the critical angle with walls of the fibre. • Hence it undergoes successive total internal relection and emerges through the other end.
- 11. 3. During summer season there seems to be water logging on roads when viewed from distance.
- 12. • The layers of air closer to the road have a low optical density as it is warmer than the upper layers. The optical density of the air increases gradually as we go higher. • When light rays coming from the surrounding objects pass through different layers of air with different optical densities, they undergo refraction and then total internal reflection. • Such deviated light rays fall on our eyes.hence their image appears to have formed on roads. • The phenomenon is called mirage.
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