total internal reflection (3)
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TOTAL INTERNAL REFLECTION&
ITS APPLICATIONS
Presented by
Chithra V M Physical Science GCTE Thycaud
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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
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Bending of light takes place when light passes obliquely from one
transparent medium to another.
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• When light ray enters from a denser medium to a rarer medium it bends away from the normal
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As angle of 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
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• When angle of incidence becomes greater than critical angle the incident ray is totally reflected
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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
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Mirage
The optical 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
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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
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Diamond
The critical angle of diamond is very small The cut of diamond favors total internal
reflection Rays entering the top of diamond reflects
internally
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THANK YOU