Physical Optics — Physics MCQs (Class 11)
Free chapter-wise Physics MCQs with answers for MDCAT, FSc and entry tests.
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#17 In a diffraction grating experiment, which color of light is deviated the most?
A) Red
B) Yellow
C) Green
D) Violet
#18 The formula for the position of the m-th minimum in a single-slit diffraction pattern is \( a \sin\theta = m\lambda \). For the first minimum, m is equal to:
A) 0
B) 0.5
C) 1
D) 2
#19 X-ray diffraction is used to study the structure of crystals because the wavelength of X-rays is:
A) Much larger than the atomic spacing
B) Much smaller than the atomic spacing
C) Comparable to the atomic spacing
D) Zero
#20 In Newton's rings experiment, the center of the pattern is dark when using reflected light because the phase change at the lower surface is:
A) 0°
B) 45°
C) 90°
D) 180°
#21 The colors seen in a soap bubble are due to:
A) Dispersion
B) Interference
C) Scattering
D) Diffraction
#22 If the angle between the axis of the analyzer and the polarizer is 90°, the intensity of transmitted light is:
A) Maximum
B) Minimum (zero)
C) Half of the maximum
D) One-fourth of the maximum
#23 The resolving power of a grating is directly proportional to:
A) The wavelength of light used
B) The order of the spectrum
C) The number of rulings on the grating
D) Both B and C
#24 In a Michelson interferometer, a bright fringe is observed when the path difference between the two beams is:
A) \( m\lambda \)
B) \( (m + \frac{1}{2})\lambda \)
C) \( \frac{\lambda}{2} \)
D) \( 2m\lambda \)
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