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Chapter 31: Problem 4

A diverging lens always makes a reduced image. Could you use such a lens to start a fire by focusing sunlight? Explain.

Short Answer

Expert verified
No, it is not possible to start a fire using sunlight and a diverging lens, as the lens spread the light rays out rather than concentrating them at a point to create the required heat.

Step by step solution

01

Understanding a Diverging Lens

In optics, a diverging lens, or a concave lens, is a lens that diverts light rays that are traveling parallel to its axis, causing them to diverge, or spread out. This means, unlike a converging lens, it doesn't concentrate light to a single point.
02

Starting a Fire with Sunlight

To start a fire with sunlight, the rays must be focused onto a small spot. This concentration of sunlight raises the temperature significantly, enough to ignite a combustible material.
03

Applying the Properties of a Diverging Lens to the Situation

However, a diverging lens spreads out the light rays and does not concentrate them to a single point. Therefore, it can't raise the temperature high enough to start a fire by focusing sunlight.

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Most popular questions from this chapter

The cornea of the human eye has refractive index \(1.38,\) while the eye's lens has a graduated index in the range 1.38 to \(1.40 ;\) use 1.39 for this problem. For the aqueous humor between cornea and lens, \(n=1.34 .\) Find the angle through which light is deflected at the first surface of (a) the cornea and (b) the lens, if it's incident at \(20^{\circ}\) to the normal at each surface. Your result shows that the cornea is the dominant refractive element in the eye.

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