A flash light is at the bottom of a 2m deep pool find the, Physics

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A flash light is at the bottom of a 2m deep pool find the

A flash light is at the bottom of a 2m deep pool.

a) Find the critical angle of incidence for the light that is trapped or reflected back
b) The light that escapes the pool form a round illuminating circle at the surface. Find its radius. ( Hint: Use the information in part (a), as well as the fact that the flash lamp is two meters from the surface to answer this question using trigonometric formulas) ?

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Physics: A flash light is at the bottom of a 2m deep pool find the

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