REFRACTION
SNELL'S LAW · CRITICAL ANGLE · TIR
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Refraction of Light
AIR (n = 1.00)
GLASS (n = 1.50)
normal
i
r
TOTAL INTERNAL REFLECTION
i
=
angle of incidence
r
=
angle of refraction
direction
1. Snell's Law
n = sin i / sin r
glass: n = 1.5
sin i =
sin r =
2. Critical Angle
sin C = 1 / n
for glass
C = 41.8°
· i > C → TIR
C
0°
90°
3. Remember
Optical fibre works by TIR
A diamond sparkles because of TIR too
MATRIC PHYSICS · GEOMETRICAL OPTICS · PUNJAB BOARDS
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