Question

nalini draws a ray diagram for an object in front of a concave mirror. She draws a ray starting from top of the object and falling on mirror perpendicularly.The ray after reflection will?
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Answer 1

Answer:

The ray will reflect back such that ray of incidence coincide with ray of reflection.

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Answer 2

The ray after reflection will trace back its initial path.

But why?

• This can be explained by the phenomenon of perpendicular reflection of light.

• When the light ray is originating from the object and falling perpendicularly on the concave mirror, the ray undergoes "normal reflection".

• The word 'normal' stands for 'perpendicular'.

• As the reflection is perpendicular, the angle of reflection remains 0° and the ray traces back on its initial path.

• This type of ray is possible only when the ray passes through the centre of curvature of the mirror.

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