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| Q. |
Parabolic mirros are used in – |
| A. | Car headlights |
| B. | Driving mirrors |
| C. | Dentists mirros |
| D. | Shaving mirros |
| Answer» A. Car headlights | |
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Explanation: A parabolic reflector (mirror) transforms an incoming plane wave traveling along the axis into a spherical wave converging toward the focus. Since the principles of reflection are reversible, parabolic reflectors can also be used to project energy of a source at its focus outward in a parallel beam, used in devices such as spotlights and car headlights. |
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