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Chapter 5: Q36E (page 1153)

A lensmaker wants to make a magnifying glass from glass that has an index of refraction n = 1.55 and a focal length of 20.0 cm. If the two surfaces of the lens are to have equal radii, what should that radius be?

Short Answer

Expert verified

The required radius is 22 cm with different sign.

Step by step solution

01

Determine the required radius

Use the Lensmaker’s equation

Substitute the given values into the equation

We want the term positive, to make it positive, R2must be negative and R1is positive

Therefore, if the two surfaces of the lens are to have equal radii, the radii should be 22 cm and 22 cm.

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