Which of the following devices is not suitable to obtain a parallel beam of light, when a beam of light incident on it from a nearby point source?Only one correct answerA.Only plane mirrorB.Only convex mirrorC.Only concave lensD.All of these
Question
Which of the following devices is not suitable to obtain a parallel beam of light, when a beam of light incident on it from a nearby point source?Only one correct answerA.Only plane mirrorB.Only convex mirrorC.Only concave lensD.All of these
Solution
The correct answer is B. Only convex mirror.
Here's why:
A. Plane Mirror: A plane mirror can produce a parallel beam of light when the light from a point source is incident on it. The light rays, after reflection, will be parallel to each other.
B. Convex Mirror: A convex mirror diverges light. So, when a beam of light is incident on it from a nearby point source, it will not produce a parallel beam of light. Instead, it will diverge the light rays.
C. Concave Lens: A concave lens can also produce a parallel beam of light when the light from a point source is incident on it. The light rays, after refraction, will be parallel to each other.
D. All of these: This option is incorrect because both a plane mirror and a concave lens can produce a parallel beam of light. The only device that cannot is a convex mirror.
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