Optics Question 154
Question: In Young’s double slit experiment the y-coordinates of central maxima and 10th maxima are 2 cm and 5 cm respectively. When the YDSE apparatus is immersed in a liquid of refractive index 1.5 the corresponding y-coordinates will be
Options:
A) 2 cm, 7.5 cm
B) 3 cm, 6 cm
C) 2 cm, 4 cm
D) 4/3 cm, 10/3 cm
Show Answer
Answer:
Correct Answer: C
Solution:
Fringe width b µ l.
Therefore, l and hence b decreases 1.5 times when immersed in liquid.
The distance between central maxima and 10th maxima is 3 cm in vacuum.
When immersed in liquid it will reduce to 2 cm.
Position of central maxima will not change while 10th maxima will be obtained at y = 4cm.
