Optics Light and shadow what E. Imagine that you held a string of closely spaced

Question

Optics Light and shadow what E. Imagine that you held a string of closely spaced small bulbs one above the other would you expect to see on the screen? 156 Predict what you would see on the screen if you used a bulb with a long filament instead. Explain. bulb Check your prediction. F. The mask used in parts C-E is replaced by PERSPECTIVE one that has a triangular hole as shown. VIEW Predict what you would see on the screen when a small bulb is held next to the top of a long-filament bulb as shown. Sketch your prediction below. Triangular Compare your prediction with those of your partners. After you and your partners have come to an agreement, check your prediction. Resolve any inconsistencies. G. Predict what you would see on the screen in the situation pictured at right. PERSPECTIVE VIEW Predict what you would see on the screen if the mask were removed. Triangular Check your predictions. If any of your predictions were incorrect, resolve the inconsistency. H. Predict what you would see on the screen when an ordinary frosted bulb is held in front of a mask with a PERSPECTIVE triangular hole as pictured at right. Discuss your prediction with a tutorial instructor. Then obtain a frosted bulb and check your prediction Triangular hole Tatorials in Introductory Piysics Shaffer,

Explanation / Answer

(E)

Any two light bulbs are not coherent.

The vibrations of the electrons in the filment produces the electromagnetic waves that is light. in a second there will be so many vibrations of the electron in the filment. these vibrations do not match for two different light bulbs. so, the waves produced by any two bulbs cannot mantain constant phase difference on passing time.

thus, we cannot observe the interference pattern on the screen by the string of the equally space bulbs.

in the case of long filment, the waves released by any two closed points will be in same phase. therefore, interference pattern may be form on the screen. we can se alternatively dark and bright fringes in the screen.

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