A ray deviates at 90∘ after suffering reflection from a mirror. The angle of incidence is

90^{\circ}

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30^{\circ}

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60^{\circ}

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45^{\circ}

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none of these

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Solution

The correct option is E $45^{\circ}$
Angular deviation of the reflected ray on the plane mirror is given by
$δ = 180^{o} - 2 θ$
Given that $δ = 90^{o}$ .
$⟹ θ = 45^{o}$

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Similar questions

Q. A ray of light is incident on a plane mirror making an angle of 90° with the mirror surface. The angle of reflection for this ray of light will be:

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(c) 0°
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A ray deviates at 90∘90∘ after suffering reflection from a mirror. The angle of incidence is

The correct option is E 45∘Angular deviation of the reflected ray on the plane mirror is given byδ=180o−2θGiven that δ=90o. ⟹θ=45o

A ray deviates at 90∘ after suffering reflection from a mirror. The angle of incidence is

The correct option is E $45^{\circ}$
Angular deviation of the reflected ray on the plane mirror is given by
$δ = 180^{o} - 2 θ$
Given that $δ = 90^{o}$ .
$⟹ θ = 45^{o}$