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For the setup in Figure 35.5, the phases of the light waves emerging from slits S1 and S2 are (pick one answer) Group of answer choices The same 180 degrees different +90 degrees different –90 degrees different

For the setup in Figure 35.5, the phases of the light waves emerging from slits S1 and S2 are (pick one answer) Group of answer choices The same 180 degrees different +90 degrees different –90 degrees different

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For the setup in Figure 35.5, the phases of the light waves emerging from slits S1 and S2 are (pick one answer) Group of answer choices

The same

180 degrees different

+90 degrees different

–90 degrees different

Figure 35.5 (a) Young's experiment to show interference of light passing through two slits. A pattern of bright and dark areas appears on the screen (see Fig. 35.6). (b) Geometrical analysis of Young's experiment. For the case shown, 1₂ > r and both y and are positive. If point P is on the other side of the screen's center, 2 <r and both y and are negative. (c) Approximate geom- etry when the distance R to the screen is much greater than the distance d between the slits. (a) Interference of light waves passing through two slits Monochromatic S₁ light (b) Actual geometry (seen from the side) S₂ dsin -0 r₁ R Cylindrical wave fronts So 0 1₂ Screen 不y业 Coherent wave fronts from two slits In real situations, the distance R to the screen is usually very much greater than the distance d between the slits ... S₂ (X^^^NJI K ऋक 12 Screen (c) Approximate geometry $₂ dsin "1 T... Bright bands where wave fronts arrive in phase and interfere constructively * Ꮎ Dark bands where wave fronts arrive out of phase and interfere destructively To screen ... so we can treat the rays as parallel, in which case the path difference is simply r₂ r₁=dsin 0.
Transcribed Image Text:Figure 35.5 (a) Young's experiment to show interference of light passing through two slits. A pattern of bright and dark areas appears on the screen (see Fig. 35.6). (b) Geometrical analysis of Young's experiment. For the case shown, 1₂ > r and both y and are positive. If point P is on the other side of the screen's center, 2 <r and both y and are negative. (c) Approximate geom- etry when the distance R to the screen is much greater than the distance d between the slits. (a) Interference of light waves passing through two slits Monochromatic S₁ light (b) Actual geometry (seen from the side) S₂ dsin -0 r₁ R Cylindrical wave fronts So 0 1₂ Screen 不y业 Coherent wave fronts from two slits In real situations, the distance R to the screen is usually very much greater than the distance d between the slits ... S₂ (X^^^NJI K ऋक 12 Screen (c) Approximate geometry $₂ dsin "1 T... Bright bands where wave fronts arrive in phase and interfere constructively * Ꮎ Dark bands where wave fronts arrive out of phase and interfere destructively To screen ... so we can treat the rays as parallel, in which case the path difference is simply r₂ r₁=dsin 0.
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