3B Scientific SEK Optics - Manual (Page 11)

Exercise
Examine the shape of the shadow when the object is illuminated by two light sources!
What do we need?
1 Base plate
1 Screen
2 Tea lights
1 Shadow object
1 Mask
additionally required:
1 Sheet of white paper, 17 cm x 13 cm
Conducting the experiment
1. Attach the mask to the base plate!
2. Put two tea lights and the shadow object onto the base plate as marked on the mask! Attach the
white paper to the screen and place the screen on the right side of the base plate!
3. Carefully light the first tea light! Observe and draw the shadow behind the shadow object! Use the
given data for sketch 1!
4. Mark in sketch 1 where a shadow develops when just one tea light is lit!
5. Light the second tea light! Observe the shadow behind the shadow object!
6. Cross all shadows with different shades of grey on the paper attached to the screen!
7. Construct the beam development! Use the given data for sketch 2!
ELWE Physical experiments for education in natural science and engineering
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1 SEG - OP 1.4 Half-Shadow and Complete Shadow