Question

the diagram shows the passage of a ray of light from air into a substance x. what should the angle of a reflected ray (not drawn) be with respect to the normal? 40° 50° 70° 20°

Explanation:

Step1: Recall the law of reflection

The law of reflection states that the angle of incidence \(i\) is equal to the angle of reflection \(r\), i.e., \(i = r\).

Step2: Identify the angle of incidence

The angle between the incident ray and the normal is the angle of incidence. From the diagram, the angle of incidence \(i=40^{\circ}\).

Step3: Determine the angle of reflection

Since \(i = r\) (law of reflection), the angle of reflection \(r = 40^{\circ}\).

Answer:

\(40^{\circ}\) (First option)