Page 1 - Wave Optics Work Sheet -2

Work Sheet -2 on Physics

Chapter -10, Class -12

Wave Optics ( INTERFERENCE OF LIGHT)
1. If two sources have a randomly varying phase difference Φ(t), the

resultant intensity will be given by

2. Two coherent monochromatic light beams of intensities I and 41
superimpose. The maximum and minimum possible intensities in the

resulting beam are:
(a) 5I and I
(b) 5I and 3I
(c) 3I and I

(d) 9I and I
3. What is path difference for destructive interference?
(a) nλ
(b) n(λ +1)

(c) (2n + 1)λ/2
(d) (n +1)λ/2
4. When exposed to sunlight, thin films of oil on water of ten exhibit brilliant
colours due to the phenomenon of

(a) interference
(b) diffraction
(c) dispersion

(d) polarization
5. What happens, if the monochromatic light used in Young’s double slit

experiment is replaced by white light?
(a) No fringes are observed.
(b) All bright fringes become while.
(c) All bright fringes have colour between violet and red.

(d) Only the central fringe is white and all other fringes are coloured.
6. The phenomenon of interference is based on
(a) conservation of momentum.