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Physics with MasteringPhysics | 4th Edition | ISBN: 9780321541635 | Authors: James S. Walker
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A magnifying glass is a single convex lens with a focal

Chapter 27, Problem 50P

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QUESTION:

Problem 50P

A magnifying glass is a single convex lens with a focal length of ƒ = +14.0 cm. (a) What is the angular magnification when this lens forms a (virtual) image at —∞? How far from the object should the lens be held? (b) What is the angular magnification when this lens forms a (virtual) image at the person’s near point (assumed to be 25 cm)? How far from the object should the lens be held in this case?

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QUESTION:

Problem 50P

A magnifying glass is a single convex lens with a focal length of ƒ = +14.0 cm. (a) What is the angular magnification when this lens forms a (virtual) image at —∞? How far from the object should the lens be held? (b) What is the angular magnification when this lens forms a (virtual) image at the person’s near point (assumed to be 25 cm)? How far from the object should the lens be held in this case?

ANSWER:

Step 1 of 6

The figure shows a convex lens used as a magnifying glass.

a) The given values are

The focal length of lens is,

When the image is formed at , the angular magnification is,

where,

 - Near point distance

 - Focal length

The near point distance is,

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