# Question: A student uses a magnifying glass to examine the details

A student uses a magnifying glass to examine the details of a microcircuit in the lab. If the lens has a power of 10 D and a virtual image is formed at the student’s near point (25 cm),

(a) How far from the circuit is the lens held, and

(b) What is the angular magnification?

(a) How far from the circuit is the lens held, and

(b) What is the angular magnification?

## Relevant Questions

A person can just see the print in a book clearly when she holds the book no closer than at arm’s length (0.45 m from the eyes). (a) Does she have (1) nearsightedness, (2) farsightedness, or (3) astigmatism? Explain. (b) ...A refracting telescope has an objective with a focal length of 50 cm and an eyepiece with a focal length of 2.0 cm. The telescope is used to view an object that is 10 cm high and located 50 m away. What is the apparent ...If an electron has a kinetic energy of 2 keV, could the classical expression for kinetic energy be used to compute its speed accurately? What if its kinetic energy is 2 MeV? Explain. Events A and B happen on your x-axis. They are separated by 500 m. You observe that A occurs 1.00 μs before B. Could A have caused B? Explain. The proper lifetime of a muon is 2.20μs. If the muon has a lifetime of 34.8 μs according to an observer on Earth, what is the muon’s speed, expressed as a fraction of c, relative to the observer?Post your question