Physics
Physical Optics
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#49 In an interference pattern, the energy is:
A) Destroyed at the minima
B) Created at the maxima
C) Conserved but redistributed
D) Converted into mass
#50 The condition for the m-th maximum in a diffraction grating is:
A) \( d \sin\theta = (m + \frac{1}{2})\lambda \)
B) \( d \sin\theta = m\lambda \)
C) \( a \sin\theta = m\lambda \)
D) \( a \sin\theta = (m + \frac{1}{2})\lambda \)
#51 If a light wave is linearly polarized, the vibrations of its electric field are confined to:
A) A single plane
B) Multiple random planes
C) A circular path
D) An elliptical path
#52 The resolving power of a telescope can be increased by:
A) Using light of longer wavelength
B) Using light of shorter wavelength
C) Decreasing the aperture diameter
D) Decreasing the focal length
#53 In Newton's rings experiment, the rings are circular because the air film has:
A) Uniform thickness
B) A thickness that varies radially
C) A constant refractive index
D) A gradient refractive index
#54 A wave that requires a medium to propagate is called a:
A) Mechanical wave
B) Electromagnetic wave
C) Transverse wave
D) Longitudinal wave
#55 The phase difference between two points on a wavefront is:
A) \( \pi \)
B) \( \frac{\pi}{2} \)
C) \( 2\pi \)
D) Zero
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