A diffraction grating having 600 lines per mm is illuminated normally by light of wovelength 600 `Å`What is the heghest order of diffraction image that can be seen ?

A. diffraction grating has 800 lines per mm and is illuminated normally by parallel monochromatic light of wavelengths 560 nm and 590 nm. Calculate the difference in the angular positions of the first order spectra of the two lights on th same suide of the normal.

A diffraction grating consisting of 4000 slits per centimeter is illuminated with a monochromatic light that produces the second order diffraction at an angle of 30 ^(@) . What is the wavelenght of the light used?

A diffraction grating is ruled with 600 lines per millimetre. When monochromatic light falls normally on the grating, the first order diffracted beams are observed on the far side of the grating each making an angle of 15^@ with the normal to the grating. What is the frequency of the light?

Aparallel beam of sodium lignt falls normally of a plane grating having 4240 lines per cm. A second order line is obseved at 30^(@) to the normal. Find the wavelength. What is the highest order that can be observed with this grating? Will this line appear to be of the same colour in each order ?

A slit of aperture 1.8 mm is illuminated by light of wavelength 5,000 Å . Calculate the minimum distance light can travel before the diffraction is noticed.

A slit is located 'at infinity' in front of a lens of focal length 1 m and is illuminated normally with light of wavelength 6000Å . The first minima on either side of the central maximum of the diffraction pattern observed in the focal plane of the lens are separated by 4 mm. What is the width of the slit? [0.3 mm]

A single slit of width a is illuminated by violet light of wavelength 400 nm and the width of the diffraction pattern is measured as y. When half of the slit width is covered and illuminated by yellow light of wavelength 600 nm, the width of the diffraction pattern is