Interference and Diffraction Multiple Choice Questions and Answers

101. Which of the following phenomenon cannot be explained on the particle nature of light

1. Photo Electric Effect
2. Comptons Effect
3. Pair Production
4. Interference

102. Which of the following phenomenon produces colors in soap bubble?

1. Interference
2. Diffraction
3. Polarization
4. Dispersion

103. Whose principle or law states that each point on a wave front may be considered a new wave source? Is it

1. Snells Law
2. Huygenss Principle
3. Youngs Law
4. Hertzs Law

104. Why in Newtons rings setup, the beam splitter (mirror) is kept at 450?

1. It allows light rays to incident at 450 over the top surface of Planoconvex lens
2. It allows light rays to incident uniformly over the top surface of Planoconvex lens
3. It allows light rays to incident parallel over the top surface of Planoconvex lens
4. It allows light rays to incident at 900 over the top surface of Planoconvex lens

105. Why in Newtons rings the center spot is always dark?

1. The thickness of the film is zero at center
2. The path difference between incident ray and reflected ray is 1/2 wavelength
3. The incident ray and reflected ray undergo destructive interference
4. All of above

106. X-ray diffraction can be observed by using

1. Diffraction Grating
2. Rock salt crystal
3. Convex lens
4. Michelsons interferometer

107. A beam of light is incident on a large block of glass. The index of refraction of the glass is greater than one. Is the wavelength of the light in the glass?

1. Longer than
2. Shorter than
3. The same as the wavelength of the light in the air?
4. None of above

108. A beam of white light is passed through a diffraction grating and the resulting spectrum is allowed to fall on a screen. Which one of the following is the color of light that undergoes the greatest deviation from its original direction? Is it

1. Red
2. yellow
3. Blue
4. violet

109. A color with a wavelength longer than that of yellow is

1. Red
2. Blue
3. Violet
4. Green

110. A diffraction grating is optically equivalent to a multiple slit system in which the number of slit, N is typically

1. 2000/cm
2. 3000/cm
3. 5000/cm
4. 1000/cm