General Science

General Studies (CGL)

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The power of a lens is -2.0 D. Here 'D' stands for:

This questions was previously asked in

SSC CGL 7th March 2020 Shift-2

dilation

dioptre

degree

distance

- The power of a lens refers to how strongly the lens converges or diverges light.

- “D” in this context stands for dioptre, which is the unit used to measure lens power.

- Option 1: *Dilation* relates to widening, especially of pupils, and not lens power.

- Option 2: *Dioptre* is the correct unit. One dioptre equals the power of a lens with a focal length of one meter.

- Option 3: *Degree* is used for angles, not lens power.

- Option 4: *Distance* is not a unit for lens power; it’s a measurement of length or space.

- So, Option 2 is correct!