Question

3 to 4 lines on the dispersion of light from glass prism​

Answer 1

1)reffraction occurs two glass prism but not through glass slab because in prism the opposite sides are not parallel

2)different colours get deviated give to the difference in wavelengths when white light is thrown on prism

3)red colour being of longest wavelength it deviates the least while blue colour of shortest wavelength deviates the most

3)thus conclusion can be removed that velocity is directly proportional to wavelength which is inversely proportional to the deviation

4)the usual angle of incidence should be equal to or lie between 30 degrees to 70 degrees

4)angle of incidence + angle of emergence = angle of deviation + Angle of prism

5)it was Isaac Newton who first dispersed the white light of the sun into the seven constituent colours and also be recombined also known as recombination by keeping inverted prism