What is the focal length of a lens with power -2.0 D? | General Science MCQ | Examoogle

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What is the focal length of a lens with power -2.0 D?

-0.5 m

+0.5 m

-2.0 m

+2.0 m

Correct Answer

🔬 SC • Science Lens FormulaGeneral SciencePhysics

Option A

0.5 m

Quick Summary:

A is correct because $f = \frac{1}{-2.0} = -0.5 \text{ m}$ .

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🔬SCScience SolutionLens Formula

📋 Steps

Formula

Power of a lens $P = \frac{1}{f}$ , so focal length $f = \frac{1}{P}$ .

f=1Pf = \frac{1}{P}f=P1​

Calculation

Given $P = -2.0\text{ D}$ , $f = \frac{1}{-2.0} = -0.5\text{ m}$ . The negative sign indicates a concave (diverging) lens.

f=−0.5 mf = -0.5\text{ m}f=−0.5 m

✅

A is correct because $f = \frac{1}{-2.0} = -0.5\text{ m}$ .

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