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PHYSICS
REFRACTION OF LIGHT ON PLANE
SURFACES, CURVED SURFACES
AND GLASS PRISMS
Short revision series
Refractive index
 Refractive index = real depth
apparent depth
i
r
Medium 1
Medium 2
Laws of refraction
1. The incident ray, the reflected ray and the
normal at point of incidence all lie in the
same plane
2...
Eg
 If the angle of refraction is 200 , What is the
angle of incidence if the refractive index of
air to glass is 1.5?
solution
ang = sin i/sin r
1.5 = sin i/sin 20
sin i = 1.5sin20 = 1.36
i = sin-1 1.36
Refraction of light through a trangular
prism
 n = sin ½ (dm + A)
sin ½ A
 A= refracting angle of prism
 dm = minimum a...
Total internal reflection and critical
angle
 Total internal reflection occcurs when the
critical angle is exceeded for l...
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Refractionoflight onplanesurfacescurved

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prepwalk

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Refractionoflight onplanesurfacescurved

  1. 1. PHYSICS REFRACTION OF LIGHT ON PLANE SURFACES, CURVED SURFACES AND GLASS PRISMS Short revision series
  2. 2. Refractive index  Refractive index = real depth apparent depth i r Medium 1 Medium 2
  3. 3. Laws of refraction 1. The incident ray, the reflected ray and the normal at point of incidence all lie in the same plane 2. SNELL’s law: The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant for a given pair of media  the constant is known as the refractive index  ang = sin i (air) = velocity of light in air  sin r (glass) velocity of light in glass
  4. 4. Eg  If the angle of refraction is 200 , What is the angle of incidence if the refractive index of air to glass is 1.5?
  5. 5. solution ang = sin i/sin r 1.5 = sin i/sin 20 sin i = 1.5sin20 = 1.36 i = sin-1 1.36
  6. 6. Refraction of light through a trangular prism  n = sin ½ (dm + A) sin ½ A  A= refracting angle of prism  dm = minimum angle of deviation i r r dm A
  7. 7. Total internal reflection and critical angle  Total internal reflection occcurs when the critical angle is exceeded for light travelling from a dense to a less dense medium  Critical angle is the incident angle at which the angle of refraction is 900 when light passses from a denser to a less dense medium.  ang = 1/sinC

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