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[" 20.A man at the bottom of a pool want...

[" 20.A man at the bottom of a pool wants to signal to a "],[" person lying at the edge of the pool.The man should "],[" beam his water proof light "],[" (a) vertically upwards "],[" (b) at an angle to the vertical which is less than the "],[" critical angle."],[" (c) at an angle to vertical which is equal to the criti- "],[" cal angle."],[" (d) at an angle to the vertical which is greater than "],[" critical angle."]

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