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## Homework Statement

At the shallow end of a swimming pool, the water is 70.0 cm deep. The diameter of the cone of the light emerging from the water into the air above, emitted by a light source 10.0 cm in diameter at the bottom of the pool and measured by an observer on the edge of the pool 2.50 m away, is

a) 1.60 m

b) 1.70 m

c) 1.75 m

d) 1.80 m

## Homework Equations

nsin(angle)=nsin(angle)

nsin(criticalangle)=nsin90

## The Attempt at a Solution

I am really confused, can anybody help me? I don't know where to start.

Thanks