Pasco OS-8500 INTRODUCTORY OPTICS SYSTEM Manuel d'utilisateur télécharger pdf (Page 63)

012-02744K Introductory Optics System

➃ There is nearly exact agreement. The average error

in focal length is 0.06%, the average error in mag-

nification is 2.5%. Discrepancies are introduced

due to uncertainty in the location of exact focus

and uncertainty in measuring the size of the image.

➄ The final two. If the object is located at the focal

point of the lens, then the image will be located at

infinity. This was the problem with the 75mm mea-

surement: our optics bench was not long enough to

handle this distance. If the object is located inside

the focal length of the lens, then the image will be

a virtual image on the same side of the lens as the

object. Such an image can not be seen on a

viewscreen: this was the problem with the 50mm

measurement.

Answers to – Questions

➀

➁ Yes, but it will be a virtual image instead of a real

image, and it would be on the same side of the lens

as the object.

➂ I would place the object at f. This would give me

an infinitely large image an infinite distance from

the lens.

Exp 8: Light and Color

The colors of light

➀ Yes. As you change the angle of the cylindrical

lens, you can see the white light gradually break

up into its component colors.

➁ The light where the three colors intersect is white.

This supports Newton’s theory by showing that

white light is the combination of the other colors.

The colors of objects

➤➤

➤Note: The best way to verify the colors of the

rays is to look directly into the rays, rather than

observing them on the ray table. You may

dispense with the ray table entirely, if you wish.

➀ The transmitted rays are green. There are two sets

of reflected rays: they reflect from the front and

rear surfaces of the filter. The front-surface reflec-

tions are white, the rear-surface reflections are

green.

➁ Now there are three sets of reflections: one white

and two green. The white comes from the front of

the green filter, one green reflection comes from

the back of the green filter, and one green reflec-

tion comes from the front of the red filter.

➂ The reflected rays are the same color as the inci-

dent light: blue, in this case. (The transmitted rays

are a faint green.)

➃ The green filter appears green because it transmits

green light. It reflects whatever color is incident on

it, but transmits primarily green. When we look at

it, we see mainly the transmitted light.

➤➤

➤Another Note: The second portion of this lab

may be slightly misleading. Most objects appear

to be whatever color they are because they

reflect that color, not because they transmit that

color. The filters reflect all colors of incident

light because they are highly polished. If they

had a matte finish, then they would reflect

mainly their own color.

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Pasco OS-8500 INTRODUCTORY OPTICS SYSTEM Manuel d'utilisateur Page 63

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