1. A ray of light travels from water to glass. What will be the angle of refraction in glass if the angel of incidence in water is 20 degree? The refractive index of water is 1.33 and that of glass is 1.5.

Asked by Sukrit Saha | 11th Dec, 2015, 07:55: PM

Expert Answer:

begin mathsize 14px style From space Snell apostrophe straight s space law comma space we space have straight n subscript straight w sini equals straight n subscript straight g sinr therefore sinr equals fraction numerator straight n subscript straight w sini over denominator straight n subscript straight g end fraction therefore sinr equals fraction numerator 1.33 cross times sin 20 over denominator 1.5 end fraction therefore sinr equals fraction numerator 0.4549 over denominator 1.5 end fraction therefore sinr equals 0.3033 therefore straight r equals sin to the power of negative 1 end exponent 0.3033 therefore straight r equals 17.66 degree end style

Answered by Romal Bhansali | 13th Dec, 2015, 10:59: AM