Which of the following lenses will bend the light rays through largest

Which of the following lenses will bend the light rays through largest angle?

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Lens with power +2·0 D

Lens with power +2·5 D

Lens with power –1·5 D

Lens with power –2·0 D

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This question was previously asked in

UPSC CDS-2 – 2020

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The power of a lens is a measure of its ability to converge or diverge light rays. It is defined as the reciprocal of the focal length in meters (P = 1/f). A lens with a higher absolute value of power bends light rays through a larger angle. Comparing the absolute values of the given powers: |+2.0 D| = 2.0 D, |+2.5 D| = 2.5 D, |-1.5 D| = 1.5 D, |-2.0 D| = 2.0 D. The largest absolute power is 2.5 D, corresponding to the lens with power +2.5 D. Therefore, this lens will bend the light rays through the largest angle.

The power of a lens (absolute value) indicates the extent to which it bends light; higher power means greater bending.

The sign of the power indicates the type of lens: positive power for a converging (convex) lens and negative power for a diverging (concave) lens. Converging lenses bring parallel rays together, while diverging lenses spread them out. However, the magnitude of bending is determined by the absolute value of the power.

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