A Ray of Light in Water (Index N₁)is Incident on Its

question 18

Multiple Choice

A ray of light in water (index n₁) is incident on its surface (with air) at the critical angle.Some oil (index n₂) is now floated on the water.The angle between the ray in the oil and the normal is:

• A)sin^-1(1.00)
• B)sin^-1(1/n₁)
• C)sin^-1(1/n₂)
• D)sin^-1(n₁/n₂)
• E)sin^-1(n₂/n₁)

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