The inside portion of part of a hollow metal sphere of diameter 20cm is polished. The portion will therefore form a?
The velocities of light in air and glass are 3.0 x 10\(^8\)ms\(^{-1}\) and 2.0 x 10\(^8\)ms\(^{-1}\) respectively. If the angle of refraction is 30º, the sine of the angle of incidence is?
An astronomical telescope is said to be in normal adjustment when the?
A 2H inductor has negligible resistance and is connected to a \(\frac{50}{\pi}\) Hz A.C supply. The reactance of the inductor is?
The process of energy production in the sun is?
