Physics
Physical Optics
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#25 Light appears to travel in straight lines because:
A) Its wavelength is very small
B) Its frequency is very high
C) It is not a wave
D) It is polarized
#26 A wavefront is defined as a surface of:
A) Constant phase
B) Constant amplitude
C) Constant frequency
D) Constant wavelength
#27 Huygens' principle is used to explain:
A) Reflection only
B) Refraction only
C) Both reflection and refraction
D) Particle nature of light
#28 Which of the following is an example of a longitudinal wave?
A) Light wave
B) Radio wave
C) Sound wave in air
D) Wave on a string
#29 The principle of superposition states that the resultant displacement at a point is the:
A) Sum of the displacements due to individual waves
B) Difference of the displacements due to individual waves
C) Product of the displacements due to individual waves
D) Vector product of the displacements
#30 In a destructive interference, the energy of the waves:
A) Is destroyed
B) Is created
C) Is redistributed
D) Becomes zero everywhere
#31 The path difference for destructive interference must be:
A) An integral multiple of the wavelength
B) An odd half-integral multiple of the wavelength
C) An even multiple of the wavelength
D) Zero
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