THE LIGHT How does the light propagate?. 1)To verify that light propagates in straight lines 2)To compare an object with its projection on a rigid screen.

Presentazione sul tema: "THE LIGHT How does the light propagate?. 1)To verify that light propagates in straight lines 2)To compare an object with its projection on a rigid screen."— Transcript della presentazione:

1 THE LIGHT How does the light propagate?

2 1)To verify that light propagates in straight lines 2)To compare an object with its projection on a rigid screen.

3 Instruments: 1)Rigid screen 2)Source of light (torch) 3)Object-semple (Card of dimensions 7x5 cm) 4)Rule to measure the dimension of the sample and the distances Proceeding...

4 We have put a card of fixed dimensions at a distance of 20 cm from the screen and at a distance of 10 cm from the source of light (formed by 3 led at different highs) and we have compared the high of the object with the ones of its projection.

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6 After that we have notice that the projection is not composed by a uniform shadows, it is formed by shadows of different density, as the light rays coming from the torch aren’t perfectly collimated, they are not perfectly parallel to form a thin beam. We have reported the results on the notebook…

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8 Using a different source of light in order to have collimated rays, we notice that light rays, joining the source of light the extreme of the object and its projection, form a straight line and similar triangles.

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10 Per avvalorare la nostra tesi abbiamo provato ad alterare la distanza campione-schermo notando che oltre che a conservarsi la propagazione della luce in linea retta, si manteneva costante anche il rapporto di similitudine, ossia la tangente (rapporto fra i cateti dei due triangoli)

11 Rebecca Contardi Alessandro Sangiorgi Martino Scoca Loris Rosina