A) Spherical concave
B) plane
C) Cylindrical
D) parabolic concave
Correct Answer: D
Solution :
[d] Parabolic reflectors are used to collect energy from a distant source (for example sound waves or incoming star light) and bring it to a common focal point, thus correcting spherical aberration found in simpler spherical reflectors. Since the principles of reflection are reversible, parabolic reflectors can also be used to project energy of a source at its focus outward in parallel beam, used in devices such as spotlights and car headlights.
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