Pasco OS-8500 INTRODUCTORY OPTICS SYSTEM Manuel d'utilisateur télécharger pdf (Page 71)

012-02744K Introductory Optics System

do di m Real/Virtual Inv/Uninv

f/16 -f/15 16/15 Virtual Uninverted

f/8 -f/7 8/7 Virtual Uninverted

f/4 -f/3 4/3 Virtual Uninverted

f/2 -f 2 Virtual Uninverted

3f/4 -3f 4 Virtual Uninverted

7f/8 -7f 8 Virtual Uninverted

15f/16 -15f 16 Virtual Uninverted

f No image formed (A.K.A. “Image at Infinity”)

17f/16 17f -16 Real Inverted

9f/8 9f -8 Real Inverted

5f/4 5f -4 Real Inverted

3f/2 3f -2 Real Inverted

7f/4 7f/3 -4/3 Real Inverted

15f/8 15f/7 -8/7 Real Inverted

31f/16 31f/15 -16/15 Real Inverted

2f 2f -1 Real Inverted

33f/16 33f/17 -16/17 Real Inverted

17f/8 17f/9 -8/9 Real Inverted

9f/4 9f/5 -4/5 Real Inverted

5f/2 5f/3 -2/3 Real Inverted

11f/4 11f/7 -4/7 Real Inverted

23f/8 23f/15 -8/15 Real Inverted

3f 3f/2 -1/2 Real Inverted

5f 5f/4 -1/4 Real Inverted

10f 10f/9 -1/9 Real Inverted

100f 100f/99 -1/99 Real Inverted

Exp 19: The Projector

➃ It is not possible to project an uninverted image

with one lens. (This is why projector slides must be

put in upside down and backwards.)

➄ The image from a projector may be viewed with-

out a screen, but the observer must be looking to-

wards the lens, on the opposite side of the lens

from the object.

The observer will see the image floating in space on

the near side of the lens. (This is easiest to see when

the magnification is about one.) It will be somewhat

difficult to focus both eyes on the image at the same

time, but when it happens, the effect is startling.

➀ If the object distance is less than the focal length of

the lens, then the image formed is a virtual image,

located on the same side of the lens as the object.

This can not be focused on a viewing screen.

➁ If the object distance is greater than 2f, then the im-

age will be reduced in size. It will still be a real im-

age, so it may be focused on the screen.

➂ One practical limit to the magnification is the size

of the lens used, another is the amount of light

available. Magnified images are dimmer than re-

duced images, because the same amount of light is

spread out over more area. If the image is magni-

fied too much, it may not be visible.

Object Lens Image View from here

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Pasco OS-8500 INTRODUCTORY OPTICS SYSTEM Manuel d'utilisateur Page 71

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