## Practice MCAT Question - Q7 - Answer!

**The index of refraction for water is 1.33 and that for glass is 1.50. A light ray strikes the water/glass boundary with an incident angle of 30.0° on the water side. Which statement is most likely true for its refracted angle in the glass?**

**A.**The angle of refraction is 26.3°.

**B.**The angle of refraction is 34.7°.

**C.**The angle of refraction is 30.0°.

**D.**The angle of refraction is 60.0°.

*The correct answer is (A). Snell’s law is:*

*n*

_{1}sin(theta_{1}) = n_{2}sin(theta_{2})*1.33 sin 30°= 1.50 sin(theta*

_{2})

*Since n*

_{1}< n_{2}, then sin(theta_{1}) > sin(theta_{2}). For sin 30° > sin(theta_{2}), 30° must be greater than*theta2, for which choice (A) is the only reasonable answer.*

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