Diffraction of Light

Light, from a monochromatic source, is made to fall on a single slit of variable width. An experimentalist records the following data for the linear width of the principal maxima on a screen kept at a distance of 1 m from the plane of the slit.
 

Using the observations from this data estimate the value of the wavelength of light used.

In a single slit diffraction experiment, a slit of width ‘d’ is illuminated by red light of wavelength 650 nm. For what value of ‘d’ will

​(i) the first minimum fall at an angle of diffraction of  $30°$ , and

(ii) the first maximum fall at an angle of diffraction of  $30°$ :

In a single slit diffraction experiment, a slit of width $d$ is illuminated by red light of wavelength $650 \mathrm{nm}$. For what value of $d$ will 

​(i) the first minimum fall at an angle of diffraction of  $30°$ and

(ii) the first maximum fall at an angle of diffraction of  $30°$

A parallel beam of light of wavelength $600\mathrm{\hspace{0.17em}}\mathrm{nm}$ is incident normally on a slit of width $a$. If the distance between the slit and the screen is $0.8\mathrm{\hspace{0.17em}}\mathrm{m}$ and the distance of 2^nd order minimum from the centre of the screen is $1.5\hspace{0.17em}\mathrm{mm}$, calculate the width of the slit.

Yellow light is used in a single slit diffraction experiment with slit width of 0.6 mm. If yellow light is replaced by X-rays, then the observed pattern will reveal,

Yellow light is used in a single slit diffraction experiment with slit width of $0.6 \mathrm{mm}$. If yellow light is replaced by X-rays, then the observed pattern will reveal,

Consider Fraunhoffer 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 wavelets from the opposite edges of the slit is

Consider Fraunhoffer 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 wavelets from the opposite edges of the slit is

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

A slit of width $d$ is placed in front of a lens of focal length $0.5 \mathrm{m}$ and is illuminated normally with light of wavelength $5.89\times {10}^{-7} \mathrm{m}$. The first diffraction minima on either side of the central diffraction maximum are separated by $2\times {10}^{-3} \mathrm{m}$. The width $d$ of the slit is_________$m.$

In a single slit diffraction experiment $\lambda =600 \mathrm{nm}$, if at $\theta =30°$ first minima is formed then find the width of slit $\left(a\right)$ in $\mu \mathrm{m}$.

Light of wavelength$5000 \stackrel{\circ }{A}$is incident normally on a plane transmission grating. Find the difference in deviations in the first and third order spectra. The number of lines on grating is $6000$ per$cm$.

 In Young's double slit experiment, a mica slit of thickness $t$ and refractive index $\mathit{\mu }$ is introduced in the ray from the$\mu$ first source S. By how much distance the fringes pattern will be displaced
 

The angular width of the central maximum in the Fraunhofer's diffraction pattern is measured. The slit is illuminated by the light of wavelength $6000 \stackrel{\circ }{\mathrm{A}}$. If the slit is illuminated by the light of another wavelength, angular width decreases by $30\%$. The wavelength of light used is

For what distance is ray optics a good approximation when the aperture is $4 \mathrm{mm}$ wide and the wavelength is $500 \mathrm{nm}$ ?

A parallel beam of light of diameter $1.8 \mathrm{cm}$ contains two wavelengths $4999.75Å$ and $5000.25Å$. The light is incident perpendicularly on a large diffraction grating with $5000$ lines per centimetre. What will be the angular separation (in radians) of two wavelengths at order $n=2$?

A parallel beam of green light of wavelength $546\mathrm{nm}$ passes through a slit of width $0.40\mathrm{mm}$. The transmitted light is collected on a screen $40\mathrm{cm}$ away. What will be the distance between two first order minima?

Why does intensity keep on decreasing as you move away from Central Maxima in diffraction.

How can light travels in a straight line path ?

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 $\alpha$.