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In young's double slit experiment with slits of equal width, the slits are covered with sheets of transparent material having thickness 1 mm and refractive index 1.6 and thickness ‘t’ and refractive index 1.4. If the central bright fringe is formed at the position where it was previously formed when the slits were un covered, find ‘t’. 

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By Expert Faculty of Sri Chaitanya
a
1.75 mm
b
1.2 mm
c
1.5 mm
d
0.8 mm

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detailed solution

Correct option is C

When the slits are covered, the net path difference between waves at the position of central bright fringe =t1μ1−1~t2μ2−1∴ t1μ1−1~t2μ2−1=0⇒t2=t1μ1−1μ2−1=f×1.6−11.4−1mm=1.5 mm
ctaimg

ctaimg

Similar Questions

In a double slit experiment, the slits are separated by a distance d and the screen is at a distance D from the slits. If a maxima is formed just opposite to each slit, then what is the order of the fringe so formed?

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