Physics
Physical Optics
Page 9 of 17
#65 The phenomenon which proves that light waves are transverse is:
A) Interference
B) Diffraction
C) Polarization
D) Reflection
#66 When unpolarized light is incident on a polarizer, the intensity of the transmitted light is:
A) The same as the incident light
B) Half of the incident light
C) Zero
D) Double the incident light
#67 In a double-slit experiment, the fringe width is \( \beta \). If the entire apparatus is immersed in water (refractive index \( \mu \)), the new fringe width will be:
A) \( \beta \)
B) \( \mu \beta \)
C) \( \frac{\beta}{\mu} \)
D) \( \beta / \mu^2 \)
#68 A wave is described by \( y = A \sin(kx - \omega t) \). The quantity \( k \) is called the:
A) Angular frequency
B) Wave number
C) Period
D) Phase constant
#69 The wave number \( k \) is related to the wavelength \( \lambda \) by:
A) \( k = \frac{2\pi}{\lambda} \)
B) \( k = \frac{\lambda}{2\pi} \)
C) \( k = 2\pi\lambda \)
D) \( k = \frac{1}{\lambda} \)
#70 The angular frequency \( \omega \) is related to the frequency \( f \) by:
A) \( \omega = 2\pi f \)
B) \( \omega = \frac{f}{2\pi} \)
C) \( \omega = \pi f \)
D) \( \omega = \frac{1}{f} \)
#71 The phase velocity of a wave is given by:
A) \( v = f\lambda \)
B) \( v = \frac{f}{\lambda} \)
C) \( v = \frac{\lambda}{f} \)
D) \( v = \frac{1}{f\lambda} \)
Page 9 of 17
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