A) zero
B) 0.3 mm
C) 0.45 mm
D) 0.15 mm
Correct Answer: B
Solution :
When a this glass plate of thickness t and refractive index \[\mu \], is introduced in one of the paths of the interfering waves then the path increases by \[(\mu -1)t\] and the whole pattern shifts by \[{{y}_{0}}=\frac{D}{d}\,(\mu -1)t\] Shifting is towards the side in which the plate is introduced without any change in fringe width. Therefore, when a glass plate of refractive index 1.5 is kept in the path of light from one of the slits, only the fringes get shifted but the fringe width remains unchanged.
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