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Laws of Reflection

Rough surface...

Question

Rough surfaces reflect parallel rays of light falling on them in different directions. Does this violate the laws of reflection? Justify your answer.

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Solution

No, rough surfaces do not violate the laws of reflection. The direction of normal at every point of incidence is different for a rough surface due to which the rays get reflected in different directions. Even so, at every point, the angle of incidence is always equal to the angle of reflection, thereby obeying the laws of reflection.

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Q. Rough surfaces reflect parallel rays of light falling on them in different directions. Does this violate the laws of reflection? Justify your answer.

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Copy this figure in your answer book and show the direction of the light ray after reflection :

Q. (a) Show using a proper diagram how unpolarised light can be linearly polarised by reflection from a transparent glass surface.
(b) The figure shows a ray of light falling normally on the face

A B

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, placed in water of refractive index

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. Will this ray suffer total internal reflection on striking the face

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? Justify your answer.

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