A converging lens forms a real image of a candle placed $30$ cm from the lens. The image is inverted and $10$ cm tall, while the object is $3$ cm tall. (i) Determine the focal length of the lens (in cm). (ii) Find its optical power in diopters.

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Accepted Answer

f ≈ 23.1 cm; Power ≈ 4.33 D

Neco 2017 Physics Question 14

A converging lens forms a real image of a candle placed \(30\) cm from the lens. The image is inverted and \(10\) cm tall, while the object is \(3\) cm tall. (i) Determine the focal length of the lens (in cm). (ii) Find its optical power in diopters.

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Neco 2017 Physics Question 14

A converging lens forms a real image of a candle placed \(30\) cm from the lens. The image is inverted and \(10\) cm tall, while the object is \(3\) cm tall. (i) Determine the focal length of the lens (in cm). (ii) Find its optical power in diopters.

Answer Options

About This Question

Master the Exam!

A converging lens forms a real image of a candle placed \(30\) cm from the lens. The image is inverted and \(10\) cm tall, while the object is \(3\) cm tall. (i) Determine the focal length of the lens (in cm). (ii) Find its optical power in diopters.