Question
Of the two slits producing interference in Young’s experiment, one is covered with glass so that light intensity passing is reduced to 50%. Which of the following is correct?
Answer: Option B
:
B
Initial intensity of bright fringes = (√I+√I)2
Final intensity of bright fringes after covering one slit with glass sheet = (√I+√I2)2
Clearly the intensity of bright fringes has decreased.
For dark fringes, initial intensity = (√I−√I)2=0 but new intensity (√I−√I2)2≠0
Clearly the intensity of dark fringes has increased.
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:
B
Initial intensity of bright fringes = (√I+√I)2
Final intensity of bright fringes after covering one slit with glass sheet = (√I+√I2)2
Clearly the intensity of bright fringes has decreased.
For dark fringes, initial intensity = (√I−√I)2=0 but new intensity (√I−√I2)2≠0
Clearly the intensity of dark fringes has increased.
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