Question
Physics Question on Optics
Two slits are made 0.1 mm apart and the screen is placed 2 m away. The fringe separation when a light of wavelength 500 nm is used is______.
Fill in the blank with the correct answer from the options given below.
A
1 cm
B
0.15 cm
C
1.5 cm
D
0.1 cm
Answer
1.5 cm
Explanation
Solution
Using the formula for fringe separation in a double-slit experiment, ∆y = λD/d, the fringe separation is calculated to be 1.5 cm.where λ = 500 nm = 500×10−9 m, D = 2m, and d = 0.1mm