A biconvex lens has a radius of curvature of magnitude 20 cm. Which of the following best describes image formed of an object of height 2 cm placed 30 cm from the lens?
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A biconvex lens has a radius of curvature of magnitude 20 cm. Which of the following best describes image formed of an object of height 2 cm placed 30 cm from the lens?

G1 Physics · Accepted Answer

Step 1: The printed stem omits refractive index. The supplied solution assumes μ = 1.5, giving focal length f = 20 cm for an equiconvex lens of curvature radius 20 cm. Step 2: With u = −30 cm, lens formula 1/f = 1/v − 1/u gives 1/v = 1/20 − 1/30 = 1/60, so v = +60 cm. Step 3: Magnification m = v/u = −2. Image is real, inverted, and 4 cm high in magnitude. Final answer: (B) Real, inverted, height 4 cm; depends on unstated μ = 1.5.