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A doctor examines a mole with a 15.0 $\mathrm{cm}$ focal length magnifying glass held 13.5 $\mathrm{cm}$ from the mole (a) Where is the image? (b) What is its magnification? (c) How big is the image of a 5.00 $\mathrm{mm}$ diameter mole?

a) $-1.35 \mathrm{m}$b) 10b) 50 $\mathrm{mm}$

Physics 103

Chapter 25

Geometric Optics

Reflection and Refraction of Light

Cornell University

University of Michigan - Ann Arbor

University of Winnipeg

Lectures

02:30

In optics, ray optics is a…

10:00

In optics, reflection is t…

00:48

A convex spherical mirror,…

01:50

Seeing an image with a mag…

01:47

A microscope has an object…

01:43

An engraver uses a magnify…

02:57

An object is located 30.0 …

02:36

The focal length of a simp…

02:51

. The focal length of a si…

01:57

An object $1.50 \mathrm{cm…

00:45

A lens that has a focal le…

01:34

(a) For a converging lens …

04:27

Callum is examining a squa…

A microscope has an eyepic…

01:46

An object 1.50 $\mathrm{cm…

05:09

A microscope has an eyepie…

01:32

(I) A microscope uses an e…

01:58

A magnifying glass has a c…

(a) What is the focal leng…

02:23

$\cdot$ A compound microsc…

03:41

A biology student uses a s…

04:47

A magnifying glass is a si…

But if the problem the distance to image so distance the eye to image can be found by using the lens formula, which is one world D I for convex lens that is a good one or a focal length minus one over distance to the object. So one or D I can be found by putting the value off the focal and which is a 15 and minus. Uh, the the distance to object is 13.5 of the 45 then, um, substituting. So we already sexually the values and to refine this expression us distance to the image is, um, is minus 13 135 um, minus 135 um, centimeters. So this is a centime juice Sunday meters, but maybe we are defying us to find the magnification unification we confined by, um deriding minus minus 1 35 Distance to image Q War P. So Peavy Heavy's a 13.5, and this gives us the emancipation off it. Then, in Farsi, the diameter off the image off the mole, which is the details can be found by the diameter off the mould times the magnification. So did I meet. A rehab is a five times magnification. Which is it, then? This gives us the 50 mm, which is equal to five centimeter. So the diameter of the image will be five centimetre. End off the problem. Thank you for watching.

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