A light ray is incident normally on a plane mirror.
(a) What is the angle of incidence?
(b) What is the path of reflected ray?

Question

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Answer 1

Case (a):
If a ray of light is incident normal to the surface of the plane mirror, then the angle of incidence is $0^{0}$ , as the normal passes perpendicularly to the mirror.
Case (b):
The Second Law of Reflection states that the angle of incidence is always equal to the angle of reflection. Therefore, the angle of reflection is same as the angle of incidence, that is, $0^{0}$ . So, the reflected ray will retrace the path of the incident ray.

Answer 2

Case (a):
If a ray of light is incident normal to the surface of the plane mirror, then the angle of incidence is

0^{0}

, as the normal passes perpendicularly to the mirror.
Case (b):
The Second Law of Reflection states that the angle of incidence is always equal to the angle of reflection. Therefore, the angle of reflection is same as the angle of incidence, that is,

0^{0}

. So, the reflected ray will retrace the path of the incident ray.

A light ray is incident normally on a plane mirror.
(a) What is the angle of incidence?
(b) What is the path of reflected ray?

$(a) 18 0^{\circ}, (b)$ same as incident ray

$(a) 18 0^{\circ}, (b)$ opposite to incident ray

$(a) 0^{\circ}, (b)$ opposite to incident ray

$(a) 0^{\circ}, (b)$ same as incident ray

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What is the angle of incidence of a ray if the reflected ray is at an angle of $9 0^{\circ}$ to the incident ray?

If an incident light ray is reflected back along its original path by a plane mirror, then its angle of incidence is:

The incident ray, reflected ray and the normal in case of a plane mirror are in the ..............

A ray of light is incident at an angle of $3 5^{0}$ on a plane mirror. What is angle $θ$ ?

Revise with Concepts

Reflection of Light and Basic Terms Associated With It

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(a)180∘,(b) opposite to incident ray

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(a)0∘,(b) same as incident ray

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What is the angle of incidence of a ray if the reflected ray is at an angle of 90∘ to the incident ray?

If an incident light ray is reflected back along its original path by a plane mirror, then its angle of incidence is:

The incident ray, reflected ray and the normal in case of a plane mirror are in the ..............

A ray of light is incident at an angle of 350 on a plane mirror. What is angle θ?

Revise with Concepts

Reflection of Light and Basic Terms Associated With It

A light ray is incident normally on a plane mirror.
(a) What is the angle of incidence?
(b) What is the path of reflected ray?

$(a) 18 0^{\circ}, (b)$ same as incident ray

$(a) 18 0^{\circ}, (b)$ opposite to incident ray

$(a) 0^{\circ}, (b)$ opposite to incident ray

$(a) 0^{\circ}, (b)$ same as incident ray

A light ray is incident on a plane mirror with $3 0^{o}$ angle of incidence. What will be the angle of reflection?

What is the angle of incidence of a ray if the reflected ray is at an angle of $9 0^{\circ}$ to the incident ray?

A ray of light is incident at an angle of $3 5^{0}$ on a plane mirror. What is angle $θ$ ?