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If upper slit...

Question

If upper slit in YDSE apparatus is covered by a thin glass slab, so that it transmits only one half of the light intensity of the lower slit, then

A

The fringe width will remain unchanged

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B

Fringe pattern will shift downwards

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C

Bright fringes will become less bright and the dark fringes will become more bright

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D

Fringe pattern will shift upwards

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Solution

The correct option is D Fringe pattern will shift upwards
• Fringe width remains unchanged.
• Pattern will shift.

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