Question

Fill in the blanks to complete the following sentences:
$i)$ A ray travelling towards the mirror is the __________.
$ii)$ Angle between reflected ray and normal is the _________.
$iii)$ The angle between the reflecting surface and the reflected ray is called ________.
A. $i)$ Incident ray, $ii)$ angle of reflection, $iii)$ glancing angle of reflection
B. $i)$ Normal ray, $ii)$ glancing angle of reflection, $iii)$ angle of incidence
C. $i)$ Reflected ray, $ii)$ glancing angle of incidence, $iii)$ glancing angle of reflection
D. $i)$ reflected ray, $ii)$ angle of incidence, $iii)$ angle of reflection

Answer 1

Hint: A light ray is a line drawn in the direction of propagation of light is called a ray of light and a group of light rays emitted by a source of light is called a light beam. A light ray always travels in a straight line and it gets reflected from mirrors whether they are plane, concave or convex mirrors.

Complete answer:
Let us check for option $i)$ by the definition we know that,
-A ray of light falling on the surface separating two mediums is called incident ray, hence a ray travelling towards a mirror will fall on a mirror surface so it’s called incident ray.
-The angle made by the reflected ray with the normal is called the angle of reflection. Hence, Angle between reflected ray and normal is called angle of reflection.
-And, we also know by definition that the angle between the reflecting surface and the reflected ray is known as glancing angle of reflection.

Hence, the correct answer is option A.

Note:When a line is drawn perpendicular to the reflecting surface at the point of incidence, this line is known as Normal. And the angle between the incident ray and the normal is called angle of incidence whereas angle of incidence is always equal to angle of reflection and it’s known as Law of reflection.