Downloaded 695 times
Total internal reflection (3)
- 1. TOTAL INTERNAL REFLECTION & ITS APPLICATIONS Presented by Chithra V M Physical Science GCTE Thycaud
- 2. Optical density Ability of a medium to refract light Two types of medium-rarer medium and denser medium Rarer medium has lower refractive index Denser medium has higher refractive index Speed of light is higher in rarer medium than in denser medium
- 3. Bending of lighttakes place when light passes obliquely from one transparent medium to another.
- 4. • When lightray enters from a denser medium to a rarer medium it bends away from the normal
- 5. As angleof incidence (i) increases so does the angle of refraction At a particular angle of incidence the angle of reflection becomes 900 Refracted ray grazes the surface at the interface between the two media The angle of incidence for which angle of refraction becomes 900 CRITICAL ANGLE
- 6. • When angleof incidence becomes greater than critical angle the incident ray is totally reflected
- 7. Total internal reflection When a ray of light travels from denser medium to rarer medium ,if the angle of incidence is greater than the critical angle the entire ray is reflected into the same medium by obeying the laws of reflection . Conditions for total internal reflection Light must travel from denser medium to rarer medium The angle of incidence must be greater than the critical angle
- 9. Mirage Theoptical illusion due to total internal reflection On sunny days the air near the ground is cooler than that higher up The light rays curve downward, producing a superior image
- 10. Optical fiber Thin hair like structure Light enters one end of the wall of the fiber strikes at less than critical angle Light undergoes repeated total internal reflection Light emerges through the other end of fiber
- 11. Diamond Thecritical angle of diamond is very small The cut of diamond favors total internal reflection Rays entering the top of diamond reflects internally
- 12.