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प्रश्न
What is the difference between Fresnel and Fraunhofer diffraction?
उत्तर
| No. | Fresnel diffraction | Fraunhofer diffraction |
| i. | The Source of light and screen is kept at a finite distance. | The Source of light and screen is at infinite distance. |
| ii. | Spherical or cylindrical wavefronts are considered. | Only plane wavefronts are considered. |
| iii. | It is observed in straight edge, narrow slit, etc. | It is observed in the single slit, double slit, etc. |
| iv. | Lenses are not used. | Convex lenses are used. |
संबंधित प्रश्न
What is the diffraction of light? How does it differ from interference? What are Fraunhofer and Fresnel diffractions?
Derive the conditions for bright and dark fringes produced due to diffraction by a single slit.
What must be the ratio of the slit width to the wavelength of light for a single slit to have the first diffraction minimum at 45.0°?
A diffraction is obtained by using a beam of yellow light. What will happen if the yellow light is replaced by the red light?
Light of wavelength 'λ' is incident on a single slit of width 'a' and the distance between slit and screen is 'D'. In diffraction pattern, if slit width is equal to the width of the central maximum then 'D' is equal to ______.
The luminous border that surrounds the profile of a mountain just before sun rises behind it, is an example of ______.
In a single slit diffraction experiment. fir t minimum for red light (589 nm) coincides with first maximum of some other wavelength `lambda'`. The value of `lambda'` is ______.
In a single slit diffraction pattern, which of the following is incorrect for fringe pattern?
The condition for observing Fraunhofer diffraction pattern from an obstacle is that the light wavefront incident on it must be ______.
In a single slit diffraction experiment, first minimum for a light of wavelength 480 nm coincides with the first maximum of another wavelength `lambda.` Then `lambda'` is ____________.
In Fresnel's biprism experiment, when the distance between the slit aperture and eye is increased, then distance between the fringes ____________.
The first minimum of a single slit diffraction pattern is observed at angle 2° with a light of wavelength 510 nm. The width of this slit is ____________.
A plane wavefront of wavelength `lambda`. is incident on a slit of width a. The angular width of principal maximum is ______.
In Young's double slit experiment, the fringe width is 12 mm. If the entire arrangement is placed in water of refractive index `4/3`, then the fringe width becomes (in mm) ______.
The increase in energy of a metal bar of length 'L' and cross-sectional area 'A' when compressed with a load 'M' along its length is ______.
(Y = Young's modulus of the material of metal bar)
Let a steel bar of length l, breadth b and depth d be loaded at the centre by a load W. Then the sag of bending of beam is ______.
(Y = Young's modulus of material of steel)
In Young's double silt experiment, two slits are d distance apart. The interference pattern is observed on a screen at a distance D from the slits. The first dark fringe is observed on the screen directly opposite to one of the slits. The wavelength of light is ______.
In Young's double slit experiment, the 8th maximum with wavelength λ1 is at a distance d1 from the central maximum and the 6th maximum with a wavelength λ2 is at a distance d2. Then d1/d2 is equal to ______.
In Young's double slit experiment, which of the following graph represents the correct variation of fringe width β versus distance D between sources and screen?
In a double-slit experiment, green light (5303 Å) falls on a double slit having a separation of 19.44 µ-m and a width of 4.05 µm. The number of bright fringes between the first and the second diffraction minima is ______.
The first diffraction minimum due to single slit diffraction is θ, for a light wavelength 5000 Å. If the width of slit is 1 × 10-4 cm, then the value of θ is ______.
Two coherent monochromatic light beams of amplitudes E10 and E20 produce an interference pattern. The ratio of the intensities of the maxim a and minima in the interference pattern is ______.
State the characteristics of a single slit diffraction pattern.
