SC-515

Refraction

Lower Sec Science · Secondary 1 · Hard · Refraction

A student shines a light ray at a rectangular glass block from air, as shown. The angle between the incident ray and the normal is

30^\circ

. After entering the glass, the ray bends towards the normal.

Which statement correctly describes the angle of refraction

r

inside the glass?

$r = 30^\circ$ because the speed of light is the same in air and glass.
$r > 30^\circ$ because light speeds up when entering glass from air.
$r < 30^\circ$ because light slows down when entering glass from air.
$r = 0^\circ$ because all light is reflected at the surface of the glass.

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