Chapter 9 - Physical Optics - 1

Chapter 9 - Physical Optics - 1

1. According to Huygen's principle, light travels in the form of:-

a) None of the above
b) Wave fronts
c) Corpuscles
d) Photons

2. The wavelength of light can be guessed by:-

a) Refraction
b) Diffraction
c) Interference
d) Reflection

3. According to Young's double slit experiment, a clear interference is obtained due to:-

a) Long wavelength of light
b) Small separation between slits
c) White screen
d) short wavelength of light

4. Interference produced by the reflected light is constructive if the thickness of the their film is:-

a) Very small
b) (m+ 1) λn
c) Approximately zero
d) (m+ 1/2) λn

5. Diffraction of x-rays by crystals shows that:-

a) The intensity of x-rays is high
b) X-rays are just like visible light
c) X-rays are electromagnetic waves
d) X-rays have very short focal length

6. Polarization of light proves that light waves are:-

a) Electromagnetic waves
b) Transverse waves
c) Longitudinal waves
d) very fast moving waves

7. Two independent light sources do not show interference because they are not:-

a) mechanical waves
b) having the same intensity
c) obeying the inverse square law
d) coherent

8. The direction of propagation of light ray is:-

a) Parallel to the wave front
b) Perpendicular to the wave front
c) Independent of the plane of the wave front
d) Parallel to the plane wave front

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