A thin air film between a plane glass plate and a convex lens is irradiated with parallel beam of monochromatic light and is observed under a microscope. We see:
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This arrangement produces Newton’s rings.
Colors of thin film are due to:
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Thin-film colors result from interference between reflected light waves.
When viewed in white light, soap bubbles show colors because of:
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Soap-bubble colors are produced by thin-film interference.
Conclusion of Young’s experiment establishes that:
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Young’s double-slit experiment demonstrates the wave nature of light.
The central part of Newton’s rings is dark due to the reason that:
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At the point of contact, one reflected ray undergoes a 180° phase change, producing destructive interference.
Stars Twinkle due to:
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Atmospheric refraction varies because air density and refractive index fluctuate.
In Young’s double slit experiment the separation between the slits is doubled and the distance between the slit and screen is halved. The fringe width becomes:
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β = λD/d; halving D and doubling d makes β one-fourth.
The fringe width in Young’s double slit experiment can be increased by decreasing:
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Fringe width β = λD/d, so decreasing slit separation d increases β.
Two waves originating from sources S₁ and S₂ having zero phase difference and common wavelength λ will show completely destructive interference at a point P if S₁P − S₂P is:
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Destructive interference occurs for an odd multiple of λ/2.
Two coherent sources of wavelength 6.2×10⁻⁷ m produce interference. The path difference corresponding to 10ᵗʰ order maximum will be:
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For the mth maximum, path difference = mλ.
Polarization of light proves:
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Only transverse waves can be polarized in the standard wave description.
What is the frequency of light whose wavelength is 5×10⁻⁷ m?
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A diffraction grating has 500 lines per mm. Its slit spacing (grating element) will be:
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Spacing = 1/(500 lines per mm) = 0.002 mm.
One cannot see through fog because:
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Fog droplets scatter light in many directions.
While carrying out Young’s Double Slit experiment for interference of light with two slits, maxima occur at angles for which (sinθ = mλ/d). Here d is:
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In Young’s double-slit equation, d is the separation between the slits.
The fringe pattern observed in Young’s double slit experiment is:
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Young’s double-slit pattern is an interference pattern.
If yellow light emitted by sodium lamp in Young’s double slit experiment is replaced by monochromatic blue light of the same intensity:
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Blue light has a shorter wavelength, and β = λD/d.
Huygen’s conception of secondary waves:
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Huygens’ principle relates wavefront construction to propagation of light.
The phenomenon of interference is shown by:
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Interference is a general wave phenomenon and can occur for different types of waves.
