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October 20, 2014

October 20, 2014

Posted by **geet** on Tuesday, June 17, 2014 at 5:52am.

- physics -
**MathMate**, Tuesday, June 17, 2014 at 7:13amAngles of incidence and refraction are angles measured from the normal.

If n represents the refractive index between air and the medium, the equation that governs the relationship between them is

n=sin(θi)/sin(θr)

which gives the value of θr as

θr=sin^{-1}(sin(θi)/n)

Since n>1 for the media named in the question, the refracted ray would bend towards normal.

Example calculation:

Take n=1.33 for water.

Angle of incidence, θi=30°

Angle of refraction

θr=sin^{-1}(sin(θi)/n)

=sin^{-1}(sin(30)/1.33)

=sin^{-1}(.3836)

=22.56°

Deviation

= 30-22.56°

=7.44°

Review your class notes and/or textbook if it is still not clear.

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