material medium air 1.0003 ice 1.31 sunflower oil 1.46 water 1.33 fused quartz 1.46 benzene 1.50 crown glass 1.52 turpentine oil 1.46 a) in which of above material speed of light is same? why? b) in which of the above material speed of light is high? c) in which of the above material speed of light is least? d) is the speed of light is same in water and ice ?
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Given:
Air 1.0003; Ice 1.31; Sunflower oil 1.46; Water 1.33; Fused quartz 1.46; Benzene 1.50; Crown glass 1.52; Turpentine oil 1.46
Explanation:
The refractive index and speed of the light is given by the relation:
n = c/v
Where,
c = Speed of the light in vacuum
v = Speed of the light in that medium
a) The speed of light is same in fused quartz and turpentine oil.
The refractive index of fused quartz and turpentine oil is same.
b) The speed of light is high in air.
The refractive index of the air has the lowest value.
c) The speed of light is least in crown glass.
The refractive index of the crown glass has the highest value.
d) No, the speed of light is not same in water and ice.
Speed of light in ice = (3 × 10⁸)/1.31 = 2.2907 × 10⁸ m/s
Speed of light in water = (3 × 10⁸)/1.33 = 2.25563 × 10⁸ m/s
Speed of light in ice > Speed of light in water
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