A thin plane membrane separates hydrogen at `7^(@) C` from hydrogen at `47^(@) C`, both being at the same pressure. If a collimated sound beam travelling from the cooler gas makes an angle of incidence of `30^(@)` at the membrane, the angle of refraction is

Light rays travel from vacuum into glass whose refractive index is 1.5 If the angle of incidence is 30^(@) calculate the angle of refraction inside the glass.

A light ray is travelling from air to water. Velocity of light in water is 2.25 x 10^8 m/s If angle of incidence is 30° calculate angle of refraction

A plane surface separates a denser medium of refractive index 1.5 from air. A plane wavefront travelling in air is incident on the interface at an angle of 30^(@) . What will be the angle of refraction ?

A sound wave travels from air to water. The angle of incidence is alpha_(1) and the angle of refraction is alpha_(2) . Assuming Snells law to be valid:

A ray of light passes through a plane boundary separating two media whose refractive indics are mu_(1) = 3//2 and mu_(2) = 4//3 . (i) If the ray travels from medium 1 to medium 2 at an angle of incidence of 30^(@) , what is the angle of refraction ? (ii) If the ray travels form medium 2 to medium 1 at the same angle of incidence, what is the angle of refraction ?

If 3.7 g of a gas at 25^(@)C occupies the same volume as 0.814 g of hydrogen at 17^(@)C and at the same pressure, then what is the molecular weight of the gas?