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Light travels through a glass plate of thickness t and having refractive index n. If c is the velocity of light in vacuum, the time taken by the light to travel this thickness of glass is
|
(a) |
(b) tnc |
(c) |
(d) |
The vertical component of the earth's magnetic field is zero at a place where the angle of dip is
| (a) 0° | (b) 45° | (c) 60° | (d) 90° |
White light may be considered to be a mixture of waves with l ranging between 3900 Å and 7800 Å. An oil film of thickness 10,000 Å is examined normally by reflected light. If m = 1.4, then the film appears bright for
|
(a) 4308 Å, 5091 Å, 6222 Å |
(b) 4000 Å, 5091 Å, 5600 Å |
|
(c) 4667 Å, 6222 Å, 7000 Å |
(d) 4000 Å, 4667 Å, 5600 Å, 7000Å |
