Which of the following can be used to focus a parallel beam of light onto a point?

Plane mirror

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Convex mirror

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Concave mirror

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Concave lens

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Solution

The correct option is C Concave mirror
Plane mirror does not converge or diverge a beam of light. Concave mirror and convex lens are converging in nature whereas convex mirror and concave lens are both diverging.

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Q. Which of the following can be used to converge a parallel beam of light?

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A convex lens of diameter 8.0 cm is used to focus a parallel bam of light of wavelength 620 nm. If the light be focused at a distance of 20 cm from the lens, what would be th eradius of the central bright spot formed?

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Which of the following can be used to focus a parallel beam of light onto a point?

The correct option is C Concave mirrorPlane mirror does not converge or diverge a beam of light. Concave mirror and convex lens are converging in nature whereas convex mirror and concave lens are both diverging.

The correct option is C Concave mirror
Plane mirror does not converge or diverge a beam of light. Concave mirror and convex lens are converging in nature whereas convex mirror and concave lens are both diverging.