2.7 The Simple Magnifier

Angular magnification gained by viewing an object closer than the near point, and the magnifying power one converging lens can deliver.

University Physics Volume 3, 2.7 The Simple Magnifier

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6 exercises

2.7 Exercise 1

If the image formed on the retina subtends an angle of $30 °$ and the object subtends an angle of $5 °$ , what is the magnification of the image?

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2.7 Exercise 3

How far should you hold a 2.1 cm-focal length magnifying glass from an object to obtain a magnification of $10 \times$ ? Assume you place your eye 5.0 cm from the magnifying glass.

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2.7 Exercise 5

You view a mountain with a magnifying glass of focal length $f = 10 \text{cm}$ . What is the magnification?

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2.7 Exercise 7

A magnifying glass forms an image 10 cm on the opposite side of the lens from the object, which is 10 cm away. What is the magnification of this lens for a person with a normal near point if their eye is 12 cm from the image?

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2.7 Exercise 9

For a normal, relaxed eye, a magnifying glass produces an angular magnification of 4.0. What is the largest magnification possible with this magnifying glass?

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2.7 Exercise 11

A magnifying glass produces an angular magnification of 4.5 when used by a young person with a near point of 18 cm. What is the maximum angular magnification obtained by an older person with a near point of 45 cm?

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