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

1. Virtual, upright, height = 1 cm
2. Virtual, upright, height = 0.5 cm
3. Real, inverted, height = 4 cm
4. Real, inverted, height = 1 cm

Correct answer: Real, inverted, height = 1 cm

Solution

Using the lens maker's formula and magnification formula, the lens is converging with a focal length of 10 cm. For an object at 30 cm, the image is real, inverted, and reduced in size with a height of 1 cm.

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