Light from a laser passes through two very narrow slits as shown in the top-view

Question

Light from a laser passes through two very narrow slits as shown in the top-view diagram at right. The photograph shows what appears on a screen that is far from the mask. The screen is bright at points X and Y and dark at point Z. In the box provided below right, show what would appear on the same part of the screen if the left slit were covered. Explain your reasoning. In particular, if the left slit were covered, would the brightness at each of the following points increase, decrease, or stay the same? Explain your reasoning in each case. Point X point Y point Z

Explanation / Answer

1) No interfence : the bright parts X and Y become less brighter and Z will also become brighter.

2) X = decrease

Y = decrease

Z = increase

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