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Question: 

An inexpensive instructional lab microscope allows the user to select its objective lens to have a focal length of 32 mm, 15 mm, or 3.9 mm. It also has two possible eyepieces with magnifications $5\times$ and $15\times$. Each objective forms a real image 160 mm beyond its focal point. What are the largest and smallest overall magnifications obtainable with this instrument?

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 

$M_{min} = 25\times, M_{max} = 620\times$

Giancoli 7th Edition, Chapter 25, Problem 50

(4:22)

Chapter 25, Problem 50 is solved.

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