A ray of light is directed down on to the surface of the water in a fish tank, making an angle of 30° with the surface. The light that is transmitted into the water makes an angle of 49° with the surface.
a) What is the angle of incidence at the air – water interface?
by What would be the angle of retlection for the partially reflected light?
c) What is the angle of refraction for the light transmitted into the water?
d) what is the angle of deviation for this transmitted light?
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Name two kinds of practical electric pumps.

Find v1, the speed of the fluid in the left end of the main pipe. express your answer in terms of h1, h2, g, and either a1 and a2 or γ, which is equal to a1a2.

Atrain is traveling at 30.0 m/s relative to the ground in still air. the frequency of the note emitted by the train whistle is 262 hz. the speed of sound in air should be taken as 344 m/s. what frequency (f approach) is heard by a passenger on a train moving at a speed of 18.0 m/s relative to the ground in a direction opposite to the first train and approaching it? what frequency (f recede) is heard by a passenger on a train moving at a speed of 18.0 m/s relative to the ground in a direction opposite to the first train and receding from it?