Fraunhofer Diffraction

Light of wavelength $600 \mathrm{n}\mathrm{m}$ is incident normally on a slit of width $0.2 \mathrm{m}\mathrm{m}$. The angular width of central maxima in the diffraction pattern is $\alpha \times {10}^{-3}$(measured from minimum to minimum). Write the value of $\alpha$.

For a diffraction from a single slit, the intensity of the central point is

Fraunhofer lines observed in the solar spectrum are due to

Discuss the diffraction grating and obtain the condition of  $\mathrm{m}{ }^{\mathrm{th}}$ Maximum,

Fraunhoffer diffraction from a single slit is observed in the focal plane of a lens of focal length $0.6 \mathrm{m}.$ The slit width is $0.2 \mathrm{mm}.$ The second minimum is observed at a distance of $3.3 \mathrm{mm}$ from the central maximum. Then the wavelength of light used is :-

Consider a Fraunhofer diffraction pattern due to circular aperture. In this case the diffraction pattern obtained at $150 \mathrm{cm}$ from lens. If the wavelength of light is $6000 \mathrm{Å}$ and diameter of aperture is $0.2 \mathrm{mm},$ what is the separation between central disc and first secondary minimum?

The angular width of the central maximum of a diffraction pattern of a single slit pattern is $60°,$ the slit width being $1\mathrm{\mu m}$. A double slit experiment is now performed with the same wavelength of light and the same slit widths and it is found that the ${10}^{\text{th }}$ interference maximum is not formed, but all lower maxima are visible. The separation between the double slits is

The condition for observing Fraunhofer diffraction from a single slit is that the light wavefront incident on the slit should be :-

A beam of light of wavelength $600 \mathrm{nm}$ from a distant source falls on a single slit $1 \mathrm{mm}$ wide and the resulting diffraction pattern is observed on a screen $2 \mathrm{m}$ away. The distance between the first dark fringes on either side of the central bright fringe is

Interpret Fraunhofer diffraction through single slit.

Consider fraunhofer diffraction pattern obtained with a single slit illuminated at normal incidence. At the angular position of the first diffraction minimum, the phase difference (in radians) between the wavelengths from the opposite edges of the slit is

A parallel beam of monochromatic light is incident normally on a slit. The diffraction pattern is observed on a screen placed at the focal plane of a convex lens. If the slit width is increased, the central maximum of the diffraction pattern will

The red light of wavelength $5400\mathrm{ }\stackrel{\circ }{\mathrm{A}}$ from a distant source falls on a slit $0.80\mathrm{ }\mathrm{mm}$ wide. Calculate the distance between the first two dark bands on each side of the central bright band in the diffraction pattern observed on a screen place $1.4\mathrm{ }\mathrm{m}$ from the slit.

A plane wavefront of wavelength $\lambda$ is incident on a single slit of width a. The angular width of principal maximum is

Light of wavelength $600 \mathrm{n}\mathrm{m}$ is incident normally on a slit of width $0.2 \mathrm{m}\mathrm{m}$. The angular width of central maxima in the diffraction pattern is $x\times {10}^{-3}.$Find the value of $x$ (measured from minimum to minimum)

Angular width of central maximum in the Fraunhoffer diffraction pattern of a slit is measured. The slit is illuminated by light of wavelength $6000 Å$ . When the slit is illuminated by light of another wavelength, then the angular width decreases by 30%. The same decrease in angular width of central maximum is obtained when the original apparatus is immersed in a liquid. The refractive index of the liquid will be

The angular size of the central maxima due to a single slit diffraction is (a $\to$ slit width)

A parallel beam of monochromatic light of wave length $5000\mathrm{ }\mathrm{Å}$ is incident normally on a single narrow slit of width 0.001 mm. Light is focused by a convex lens on the screen placed on the focal plane. First minimum will be formed for the angle of diffraction

A screen is at a distance of 1m away from the aperture. If light of wavelength 500 nm falls on an aperture, then calculate area of first HPZ and radius of third HPZ

In single slit diffraction of light of wavelength $\lambda$ by a slit of width $d,$ the size of the central maximum on a screen at a distance $b$ is