A beam of light strikes a sheet of glass at an angle of 56.0 with the normal in

Question

A beam of light strikes a sheet of glass at an angle of 56.0 with the normal in air. You observe that red light makes an angle of 38.1 with the normal in the glass, while violet light makes a 36.8 angle.

What are the indexes of refration for red and violet light?

What are the speeds of red and violet light in the glass?

A beam of light strikes a sheet of glass at an angle of 56.0 with the normal in air. You observe that red light makes an angle of 38.1 with the normal in the glass, while violet light makes a 36.8 angle.

What are the indexes of refration for red and violet light?

What are the speeds of red and violet light in the glass?

Explanation / Answer

Using snell's law,

ni sini = nr sinr

where ni = refractive index of incident medium

i = incident angle

nr = refractive index of refractive medium

r = refraction angle

ni (for air) = 1

FOr Red light :

1 * sin56 = nr_red sin38

nr_red = 1.346 ......Ans

speed = c / nr_red = (3 x 10^8 ) / 1.346 = 2.228 x 10^8 m/s ......Ans

For Violet light :

1 * sin56 = nr_violet sin36.8

nr_violet = 1.384 .........Ans

Speed = (3 x 10^8) / 1.384 = 2.168 x 10^8 m/s ........Ans

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