Question

1) In a double slit experiment, what happens to the fringe pattern when the slit separation (d) is decreased and the screen is moved away from the slit ( L is increased)?

a) fringes get further apart

b) fringes get closer together

c) cannot be determined without knowing the values of d and L

2) White light is being analyzed by a diffraction grating (100 lines/mm). In the interference pattern, the third order blue (wavelength=400 nm) appears 10 cm from the central maxima. How far away is the screen placed from the grating?

a) 0.83 m

b) 6.52m

c) 0.21m

d) 8.33m

3) Do you agree or disagree with the statement: "Single-slit interference shouldn't be possible if light was wave; for waves to interfere- you need at least two slits"

a) agree

b)disagree

Answer 1

kindly give rating

Post each question separately