Young's Double-Slit — Previous-Year Questions

Q1. In Young's experiment, fringe width is β. If the entire apparatus is immersed in water (μ = 4/3), the new fringe width is:

Q2. Two coherent sources have intensities in the ratio 1 : 4. The ratio of I_max to I_min on the screen is:

Q3. In a YDSE, slit separation d = 1 mm, screen distance D = 1 m. Light of λ = 600 nm. Fringe width is:

Q4. If white light is used in YDSE, the central fringe is:

Q5. A glass plate (μ = 1.5, t = 4 μm) is placed before one slit. For λ = 600 nm, the number of fringes by which the pattern shifts is:

Q6. In YDSE, the path difference at a point on the screen is 11λ/2. The point is: