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A magnifying glass is a single convex lens with a focal
Chapter 27, Problem 50P(choose chapter or problem)
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?
Questions & Answers
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,