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Q. 6CQ

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Found in: Page 989

### Physics for Scientists and Engineers: A Strategic Approach with Modern Physics

Book edition 4th
Author(s) Randall D. Knight
Pages 1240 pages
ISBN 9780133942651

# Consider one point on an object near a lens.a. What is the minimum number of rays needed to locate its image point? Explain.b. How many rays from this point actually strike the lens and refract to the image point?

a. Two rays needed to locate its image point.

b. Infinite number of rays from this point actually strike the lens and refract to the image point .

See the step by step solution

## Step 1: Introduction

In an optical system, a ray is the path along which light energy is conveyed from one point to another.

The laws of reflection and refraction are the categorical imperatives of geometrical optics. A light ray travels in a straight line if it is not reflected or refracted.

## Step 2: Explanation (part a)

a.

To identify the image point of a point object, precisely two rays are essential.

## Step 2: Explanation (part b)

b.

An enormous amount of rays from this point strike the lens and, after refracting through the lens, form a single point image.

Even though each light ray seems to have its own route, they all start at the same object point and end at the same image point.