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Spherical Mirror Common Terms & Rays

What is the p...

Question

What is the purpose of using a concave mirror in car headlights?

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Solution

Concave mirror:
The light spreads out to longer distances (approximately parallel) when the headlight is placed at the focus of the concave mirror.
a ray of light passing through focus becomes parallel to the principal axis after reflection.

Hence, a concave mirror is used in the car headlights.

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