Question

1. light shines on a flat mirror so that the angle between the incident ray and the mirror is 20.0°. the angle between the incident and reflected rays is: 70.0° 140.0° 20.0° 40.0°

Explanation:

Step1: Find angle of incidence

The angle between incident ray and mirror is $20.0^\circ$. The angle of incidence $i$ is measured from the normal (perpendicular to mirror), so:
$i = 90.0^\circ - 20.0^\circ = 70.0^\circ$

Step2: Apply law of reflection

Law of reflection states angle of reflection $r = i$, so:
$r = 70.0^\circ$

Step3: Calculate angle between rays

The total angle between incident and reflected rays is $i + r$:
$i + r = 70.0^\circ + 70.0^\circ = 140.0^\circ$

Answer:

140.0°