Question

A parallel beam of light of wavelength 5890 A^0
is incident on a glass plate having refractive
indx u = 1.5 such that the angle of refraction
in the plate is 60 degree calculate the smallest
thickness of glass plane which will appeas
dark by reflected light .​

Answer 1

Answer:

When a Glass Prism is used to obtain spectrum of sunlight, a second identical prism in an inverted position is kept with respect to first prism. The Inverted second prism will allow all colours of the spectrum to recombine. Thus a Beam of light will emerge from other side of the second prism.