Ray Optics: Lens — Numerical Calculation MCQ

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Lens — Numerical CalculationMediumQuestion 20238

Question

An object 6 cm tall is placed 20 cm from a converging lens (f = 15 cm). Image height is:

18 cm

1/v = 1/f + 1/u = 1/15 + 1/(−20) = 4/60 − 3/60 = 1/60 → v = 60 cm. m = v/u = 60/(−20) = −3. Image height = |m|×6 = 18 cm (inverted, real).