Physical Optics — Wave & Interference
1 / 10
Which of the following is correct about LASER light?
Laser light is monochromatic (single wavelength), coherent, and highly collimated.
2 / 10
Rayleigh criterion for resolution of two point sources states that they are just resolved when:
Rayleigh criterion: the central maximum of one diffraction pattern coincides with the first minimum of the other.
3 / 10
Diffraction effects are most significant when the slit width is:
Diffraction is most significant when the aperture size is comparable to the wavelength of light.
4 / 10
Huygens’ principle states that:
Huygens’ principle: every point on a wavefront acts as a source of secondary wavelets.
5 / 10
Anti-reflection coatings on lenses work on the principle of:
Anti-reflection coatings use destructive interference of reflected light (coating thickness = λ/4).
6 / 10
The condition for destructive interference (dark fringes) in Young’s experiment is:
Dark fringes occur when path difference = (2n-1)λ/2 (odd multiples of half-wavelength).
7 / 10
Coherent light sources have:
Coherent sources maintain a constant phase difference and the same frequency.
8 / 10
Newton’s rings are formed due to:
Newton’s rings form by interference in the thin air film between a flat glass surface and a plano-convex lens.
9 / 10
Constructive interference occurs when the path difference between two waves is:
Constructive interference requires a path difference of nλ (whole number of wavelengths).
10 / 10
Which experiment demonstrated the wave nature of light through interference?
Young’s double slit experiment produced interference fringes, confirming the wave nature of light.
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