15071 Experiment Pack - Basic Optics - info

STE 15071 EXPERIMENT PACK - BASIC OPTICS

INTRODUCTION

This experiment pack enables a progressive series of 19 student experiments starting with the development of a simple understanding of light rays, shadows and eclipses through to laws of reflection and refraction. Everything required except barreries is included in the convenient storage container. Illustrated worksheets provide instructions on use and teaching information.

 TOPICS COVERED

1)            THE DIOPTRIC PROJECTOR

2)            WHY WE SEE OBJECTS

3)            DO LIGHT RAYS EXIST?

4)            THE ILLUMINATION LAWS

5)            PLAYING WITH SHADOWS

6)            ECLIPSES

7)            LIGHT REFLECTION

8)            REFLECTION IN SPHERICAL MIRRORS

9)            WHEN THE LIGHT PASSES FROM THE AIR TO A TRANSPARENT BODY

10)        WHEN THE LIGHT PASSES FROM A TRANSPARENT BODY TO THE AIR

11)        TOTAL INTERNAL REFLECTION

12)        LENSES

13)        DECOMPOSITION OF WHITE LIGHT

14)        IMAGES IN PLANE MIRRORS

15)        IMAGES WITH LENSES

16)        THE EYE AND EYE PROBLEMS

17)        THE COMPOUND MICROSCOPE

18)        THE SLIDE PROJECTOR

EQUIPMENT

EXAMPLE EXPERIMENT

(all worksheets are provided with necessary diagrams)

EXPERIMENT 6

Equipment needed: 1 battery-holder; 1 projector; 1 lens-holder with diaphragm-holder; 1 white screen;  1 one-slit diaphragm; 1 thin converging lens; 1 plane mirror; 1 protractor; 1 spring clamps.

Mount the thin converging lens and the 1-slit diaphragm on the lens-holder equipped with diaphragm-holder. Place the lens-holder 10 cm far from the light bulb. Fix the protractor and then the plane mirror on the white screen. Secure them using the spring clamp, as described in Fig. 1.

Assemble the equipment as in Fig. 2. The light beam coming out of the slit should leave a visible trace on the protractor plane.

The angle between the light ray incident on the mirror and the line perpendicular to the mirror at the point of incidence is called angle of incidence and is indicated by the letter i. The angle between the light ray of reflected light and the same line perpendicular to the mirror is called angle of reflection and is indicated by the letter r (see Fig. 3). At first, place the items to have an angle of incidence measuring 30°.

-          Measure the size of the angle of reflection.

Repeat the experiment varying the size of the angles of incidence and measure the resulting angles of reflection.

Taking into account small measurement errors, complete the following sentence which states the fundamental law of reflection:

The angle of incidence is …………..……… to the angle of reflection.