A slt of width a illuminated by mono-chromatic ligth of wavelength 650 nm at normal incidence .Calculate the value of a when
the first minimum falls at an angle of diffraction of `30^@`,

A slt of width a illuminated by mono-chromatic ligth of wavelength 650 nm at normal incidence .Calculate the value of a when the first minimum falls at an angle of diffraction of 30^@ ,

A slt of width a illuminated by mono-chromatic ligth of wavelength 650 nm at normal incidence .Calculate the value of a when the first maximum falls at an angle of diffraction of 30^@ .

Angular width of centrl maximum in the Fraunhofer diffraction pattern of a slit is measured.The slit is iluminated by igth of wavelength 6,000 overset@A .When the slit is illuminated by light of another wavelength,the angular width decreases y 30%.Calculate the wavelength of this light. The same decrease in the angular width of centrl maximum is obtained ,when the original appartus is immersed in a liquid.Fin refractive index of the liquid.

The light of wavelength 600 nm is incident normally on a slit of width 3 mm. Calculate the linear width of central maximum on a screen kept 3 m away from the slit.

A parallel beam of ligth of wavelength 600 nm is incident normally on a slit of width d .If the distance between teh slit and the screen is 0.8 m and the distance fo teh second order maximum from teh centre of the screen is 15 mm,calculate the width of the slit.

A parallel beam of monochromatic light falls normally on a single narrow slit. How does the angular width of the central maximum in the resulting diffraction pattern depend on the wavelength of the incident light?

A beam of light of wavelength 400 nm is incident normally on a right angled prism as shown in fir.2.45. . It is observed that the light just grazes long the surface AC after falling on it.Give that there fractive index of the material of the prism varies with the wavelength as per the relation. mu=1.2 + b/(gamma^2) Calculate the value of b and the refractive index of the prism material for a wavelength gamma = 500 nm .Given theta=sin^(-1) 0.625 .

9 A parallel beam of light of wavelength 500 nm falls on a narrow slit and the resulting diffraction pattern is observed on a screen 1 m away. It is observed that the first minimum is at a distance of 2.5 mm from the centre of the screen. Find the width of the slit.

In a single slt diffraction experiment,the thrid minimum due to red light of wavelength 720 nm coinciedes with the fourth maximum due to ligth of some unkown wavelength.Find the value of the unkown wavelength.

Find the minimum thickness of a film which wioll strongly relfect the ligth of wavelength 589 nm,when incident normally on it.the refractive index of the material of the film is 1.25.