Two slits, S 1 and S 2 , illuminated by a white light source, give a white central maximum. A transparent sheet, of refractive index 1.25 and thickness t 1 , is placed in front of S 1 . Another transparent sheet, of refractive index 1.50 and thickness t 2 , is placed in front of S 2 . If the central maxima are not affected, then the ratio t 1 : t 2 will be
Text Solution
Verified by ExpertsThe correct answer is:
B
2 : 1
Since there is no shift in central maxima, the path difference introduced by the two sheets are equal.
i.e. 
Where 
and 
are refraction index
i.e. 
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