Anarrow beam of light from a laser travels through air (n = 1.00) and strikes the surface of the water (n = 1.33) in a lake at point a. the angle of incidence is 58 degrees. the depth of the lake is 2.9 m. on the flat lake-bottom is point b, directly below point a. (a) if refraction did not occur, how far away from point b would the laser beam strike the lakebottom? (b) considering refraction, how far away from point b would the laser beam strike the lake-bottom?

Part a)

d = 4.64 m

Part b)

d = 2.4 m

Explanation:

Part a)

If no refraction occurs then the light ray will move undeviating

So here we can say that the angle with the normal will remain same

so we have

so light will strike at distance of 4.64 m

Part b)

Now if refraction of light occurs

then we will use Snell's law

now we can use

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