Light passes from air into water at an angle of incidence of 42.3°. Determine the angle of refraction in the water.

Explanation:

According to Snell’s Law we have the following:  

(1)  

Where:  

is the first medium index of refraction  (air)

is the second medium index of refraction  (water)

is the angle of the incident ray  

is the angle of the refracted ray  

So, we need to find  from (1):

(2)  

(3)

Finally:

This is the angle of refraction

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