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A camera with a 50.0 $\mathrm{mm}$ focal length lens is being used to photograph a person standing 3.00 $\mathrm{m}$ away. (a) How far from the lens must the film be? (b) If the film is 36.0 $\mathrm{mm}$ high, what fraction of a 1.75 $\mathrm{m}$ tall person will fit on it? (c) Discuss how reasonable this seems, based on your experience in taking or posing for photographs.

a) $5.085 \times 10^{-2} \mathrm{m}$b) 100$\%$c) This seems quite reasonable. Since, at 3.00 $\mathrm{m}$ it is possible to get a full-length picture of a person.

Physics 103

Chapter 25

Geometric Optics

Reflection and Refraction of Light

Simon Fraser University

Hope College

University of Winnipeg

McMaster University

Lectures

02:51

In physics, wave optics is…

10:02

Interference is a phenomen…

02:12

Suppose your 50.0 $\mathrm…

05:01

You want to take a full-le…

06:07

A camera lens has a fixed …

01:51

A lens for a digital camer…

02:05

How far from the lens must…

03:03

Camera A camera with an 8.…

04:53

$\cdot$ A certain digital …

02:33

You photograph a 2.0-m-ta…

04:30

Esperanza uses a 35 -mm ca…

11:20

\bullet A person with a di…

When a camera is focused, …

02:18

A camera is supplied with …

02:08

A movie camera with a (sin…

07:12

A person on a safari wants…

05:25

(II) An 80 -mm-focal-lengt…

01:14

A camera lens used for tak…

03:19

02:22

Camera lenses are describe…

01:27

A camera lens has a focal …

A nature photographer is u…

the This is about a the distance to image. The I can be found by using the cleanses formula, which is ah, one over the icicle to wonder what if minus one over distance to the object. We're putting the values for a focal and which is a five centimeter minus one over 30. Distance to object. Is that 300 centimeters? Um, and simplifying this gives us distance to the image we have here is ah, plus five porn and 08 47 centimeters. So the distance to images, uh, this much this distance in but be we can find ah knew a chide, which is a call to magnification times the height off the person the magnification can be found by dividing. Uh, d I, which is a d. I hear we have is a, um minus five or into zero made 47 So when derided by the old distance toe object, this is 300. This gives us the magnification off. 0.0 ah, six mine. Um, so this is over identification, then substituting the value of magnification here, uh, which is important, thio zero 69 times the height of a person who Jesus. 1 75 some major. 1 75 centimeter, then. Excuse us. The you hide off the image is a two point line. 57 75 centimeter centimeter. The height This is the height off the photograph. Height off the image is a tree for 3.6 unlimited. Usually the image off the person will fit wholly on the flame off the camera. So, um, in boxy in our daily experience, off taking selfies and photographs, um, sitting away like half of meter away from the camera. So let's say this is a camera, um can take half off for water. Ah, in this part off the picture, this part of our body. If we stay like a few few meters away, let's say three meters away. Then this can take a picture off a wall off her body. End off the problem. Thank you for watching

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