Find out θ if light is falling on the pole of a concave mirror. [1 Marks]

a) 45°
b) 30°
c) 60°
d) 90°

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Solution

The correct answer is option B.
CP (Principal Axis) is normal to the mirror as it passes through the centre of curvature (C).

By the law of reflection,
Angle of incidence = Angle of reflection

Hence, θ = 30°
(1 mark)

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Q. Find θ if light is falling on the pole of a concave mirror.

Focal length of convex lens is 20 cm, focal length of concave mirror is 30 cm. And the separation between lens and mirror is 90 cm. If the object is placed 60 cm before lens, find out position of image formed by concave mirror?

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Find out θ if light is falling on the pole of a concave mirror. [1 Marks] a) 45° b) 30° c) 60° d) 90°

The correct answer is option B. CP (Principal Axis) is normal to the mirror as it passes through the centre of curvature (C). By the law of reflection, Angle of incidence = Angle of reflection Hence, θ = 30° (1 mark)

Find out θ if light is falling on the pole of a concave mirror. [1 Marks]

a) 45°
b) 30°
c) 60°
d) 90°

The correct answer is option B.
CP (Principal Axis) is normal to the mirror as it passes through the centre of curvature (C).

By the law of reflection,
Angle of incidence = Angle of reflection

Hence, θ = 30°
(1 mark)