SAT Subject Physics Practice Question 570: Answer and Explanation
11. A light ray that enters a glass block from the air is refracted because
A. the light travels faster in the glass than in the air.
B. the light travels slower in the glass than in the air.
C. the light waves invert as they enter the glass.
D. the light waves increase their amplitudes in the glass.
E. the light intensity is greater in the glass than in the air.
Correct Answer: B
The correct answer is (B). When a light ray enters an optically denser material, it bends toward the normal because the light slows down in the material.