| Figure shows a standard two-slit arrangement with slits\[{{\operatorname{S}}_{1}},{{\operatorname{S}}_{2}}\]. \[{{\operatorname{P}}_{1}},{{P}_{2}}\] are the two minima points on either side of P shows in Figure. At \[{{\operatorname{P}}_{2}}\] on the screen, there is a hole and behind \[{{\operatorname{P}}_{2}}\] is a second screen, 2-slit arrangement with slits \[{{\operatorname{S}}_{3}}\] and \[{{\operatorname{S}}_{4}}\] and a second screen behind them. |
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A) There would be no interference pattern on the second screen but it would be lighted.
B) The second screen would be totally dark.
C) There would be a single bright point on the second screen.
D) There would be a regular two slit pattern on the second screen.
Correct Answer: D
Solution :
Option [d] is correct Explanation: At \[{{P}_{2}}\] is minima due to two wave fronts in opposite phase coming from, two slits \[{{\operatorname{S}}_{1}}\] and\[{{\operatorname{S}}_{2}}\], but there is wave fronts from \[{{\operatorname{S}}_{1}},{{\operatorname{S}}_{2}}\]. So \[{{P}_{2}}\] will act as a source of secondary wavelets. Wave front starting from \[{{P}_{2}}\] reaches at \[{{\operatorname{S}}_{3}}\] and \[{{\operatorname{S}}_{4}}\] slits which will again act as two monochromatic or coherent sources and will form pattern on second screen.
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