A simple magnifying glass can focus sunlight enough to heat up paper or dry grass and start

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A simple magnifying glass can focus sunlight enough to heat up paper or dry grass and start a fire. A magnifying glass with a diameter of 4.0 cm has a focal length of 6.0 cm.
(a) Using the information found on the inside back cover of the book; estimate the size of the image of the Sun when the magnifying glass focuses the image to its smallest size.
(b) If the intensity of the Sun falling on the magnifying glass is 0.85 kW / m2, what is the intensity of the image of the Sun?
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Related Book For  book-img-for-question

Physics

ISBN: 978-0077339685

2nd edition

Authors: Alan Giambattista, Betty Richardson, Robert Richardson

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