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In Example $25.7,$ the magnification of a book held 7.50 $\mathrm{cm}$ from a 10.0 $\mathrm{cm}$ focal length lound to be 3.00 . (a) Find the magnification for the book when it is held 8.50 $\mathrm{cm}$ from the magnifier. (b) Do the same for when it is held 9.50 cm from the magnifier. (c) Comment on the trend in $\mathrm{m}$ as the object distance increases as in these two calculations.

a) $+6.67$b) $+20.0$c) The magnification $m$ increases rapidly as the object comes toward the focal length.

Physics 103

Chapter 25

Geometric Optics

Reflection and Refraction of Light

Simon Fraser University

Hope College

University of Sheffield

University of Winnipeg

Lectures

02:30

In optics, ray optics is a…

10:00

In optics, reflection is t…

00:46

The magnification of a boo…

02:36

The focal length of a simp…

02:51

. The focal length of a si…

01:34

(a) What is the focal leng…

00:45

A lens that has a focal le…

01:43

An engraver uses a magnify…

02:58

A thin lens with a focal l…

03:06

Approximating the eye as a…

05:50

An object is placed in fro…

01:47

A microscope has an object…

04:48

Two converging lenses are …

04:08

02:35

In a compound microscope, …

02:19

A jeweler’s lens of focal …

05:09

A microscope has an eyepie…

(a) For a converging lens …

01:58

What magnification will be…

00:44

$\cdot$ A thin lens with a…

03:57

\bullet A microscope with …

03:30

(III) The eyepiece of a co…

But if the given problem, we can find magnification by finding the first the d I from the formula that is one of our f physical, the one with the eye plus one award d'oh of Then we can write a d I in terms off f indio, which is one word f minus one word. D'oh old minus one. The definition of magnification we hear is a minus Thea, divided by d'oh So we'll write the eye in terms off Theo, which gives us one over minus one Were d o times one mine, one were F minus one would d'oh old power might be there. So putting the values minus one here. So the oh, we have blustery heavy 0.85 meters times one over F, which is the 10.1 minus one where 0.85 So this simplifies into 6.67 magnification in Barbie. The magnification for the O, which is, um, little 0.95 We had won awards in 0.1 He's the focal and minus deals in 0.95 Um, this gives us magnification off, plus 20 years later, plus 6.67 Um, So let me open another page here for part C. Oh, the magnification magnification increases by increasing the object distance. D'oh! By increasing increasing deal, we increase magnification them.

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