Physical Optics — Physics MCQs (Class 11)
Free chapter-wise Physics MCQs with answers for MDCAT, FSc and entry tests.
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#121 In a diffraction grating, the condition for maximum is
A) \( d \sin \theta = n \lambda \)
B) \( d \sin \theta = (n+1/2) \lambda \)
C) \( d \cos \theta = n \lambda \)
D) \( d \cos \theta = (n+1/2) \lambda \)
#122 The maximum number of orders visible with a grating of element \( d \) and wavelength \( \lambda \) is
A) \( \frac{d}{\lambda} \)
B) \( 2 \frac{d}{\lambda} \)
C) \( \frac{\lambda}{d} \)
D) \( 2 \frac{\lambda}{d} \)
#123 The phenomenon of interference can be explained by
A) Corpuscular theory
B) Wave theory
C) Quantum theory
D) Electromagnetic theory
#124 The phenomenon of diffraction can be explained by
A) Corpuscular theory
B) Wave theory
C) Quantum theory
D) Electromagnetic theory
#125 The phenomenon of polarization can be explained by
A) Corpuscular theory
B) Wave theory
C) Quantum theory
D) Electromagnetic theory
#126 The speed of light in vacuum is
A) \( 3 \times 10^8 \) m/s
B) \( 3 \times 10^{10} \) cm/s
C) Both A and B
D) Neither A nor B
#127 The wavelength of visible light is in the range
A) 400 nm to 700 nm
B) 4000 Å to 7000 Å
C) Both A and B
D) Neither A nor B
#128 The frequency of yellow light of wavelength 600 nm is
A) \( 5 \times 10^{14} \) Hz
B) \( 5 \times 10^{15} \) Hz
C) \( 5 \times 10^{16} \) Hz
D) \( 5 \times 10^{17} \) Hz
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