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_________$m.$

Use Huygen's principle to explain the formation of diffraction pattern due to a single slit illuminated by a monochromatic source of light.

 The new position of the wavelength at any instant is the envelope of the _____ wavelets at that instant.

What is speed of sound and speed of light?

Which of the following statements on sound is wrong?

Why is the diffraction of sound waves more evident in daily experience than that of light wave?

When the width of the slit is made double the original width, how would this affect the size and intensity of the central diffraction band?

Why is the diffraction of sound waves more evident in daily experience than that of light wave?

First diffraction minimum due to a single slit of width $1.0\times {10}^{-5} \mathrm{cm}$ is at ${30}^{\circ }$. Then the wavelength used is :

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

Light is diffracted at a single slit. Which of the following graphs best represents how the intensity $I$ of the diffracted light varies with the diffraction angle $\theta$?