A beam of monochromatic light traveling through air strikes a block of unknown m

Question

A beam of monochromatic light traveling through air strikes a block of unknown material. It makes an angle of 50 degrees with the normal of the surface outside the block, and an angle of 30 degrees inside the block. What is the speed of the light within the block? Keep 3 digits after decimal point.

( With explanation please)

A beam of monochromatic light traveling through air strikes a block of unknown material. It makes an angle of 50 degrees with the normal of the surface outside the block, and an angle of 30 degrees inside the block. What is the speed of the light within the block? Keep 3 digits after decimal point. Your answer should be formatted like: 0.000

Explanation / Answer

Using Snell's law

mu = sin i/sin r = sin 50/sin 30 = 1.5321

Hence speed of light in the medium, v = c/mu = 3x108/1.5321 = 1.95809x108 m/s = 1.958x108 m/s

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