Question

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

Answer 1

Answer: (B)

The light travels slower in the glass than in the air

Light rays bend or refract if they enter a glass block at an angle. When they pass from air into glass, they bend inwards and slow down. They travel in a straight line through the glass at an angle to their original direction. As they pass out from the glass into air, they bend outwards and speed up again.