Diffraction through Circular Slits
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Q. Match List – I with List –II (b is size of the object interacting with light; `I' is the distance between the object and the screen; λ is the wavelength of the light)
List−IList−IIa) b21λ≪1e) The approximation ofgeometrical optics is applicableb) b21λ≈1f) Fraunhoffer diffractionis observedc) b21λ≫1g) Fresnel diffraction is observed
List−IList−IIa) b21λ≪1e) The approximation ofgeometrical optics is applicableb) b21λ≈1f) Fraunhoffer diffractionis observedc) b21λ≫1g) Fresnel diffraction is observed
a–g, b–f, c–e
a−g, b−e, c−f- a−e, b−g, c−f
- a−f, b−g, c−e
Q. Match List – I with List –II (b is size of the object interacting with light; `I' is the distance between the object and the screen; λ is the wavelength of the light)
List−IList−IIa) b21λ≪1e) The approximation ofgeometrical optics is applicableb) b21λ≈1f) Fraunhoffer diffractionis observedc) b21λ≫1g) Fresnel diffraction is observed
List−IList−IIa) b21λ≪1e) The approximation ofgeometrical optics is applicableb) b21λ≈1f) Fraunhoffer diffractionis observedc) b21λ≫1g) Fresnel diffraction is observed
a–g, b–f, c–e
a−g, b−e, c−f- a−e, b−g, c−f
- a−f, b−g, c−e
Q. Read the statements A and B and mark the correct option.
Statement A: In Fresnel diffraction phenomenon, the source or screen or both are at finite distances from the aperture.
Statement B: In Fraunhoffer diffraction, lenses are used to modify the incoming light.
Statement A: In Fresnel diffraction phenomenon, the source or screen or both are at finite distances from the aperture.
Statement B: In Fraunhoffer diffraction, lenses are used to modify the incoming light.
- Both A and B are correct
- A is correct and B is wrong
- A is wrong and B is correct
- Both A and B are wrong
Q. In Fraunhoffer diffraction the
- Source of light and the screen appear to be at infinite distance from the slit
- The wavefront’s involved in this case are plane
- Convex lenses are used to focus the diffraction fringes on the screen
- All the above
