A diffraction grating used at normal incidence gives a line ` lamda_(1)=600Å` in a certain order supermposed on another line ` lamda_(2)=450Å` of the next higher order. If the angle of diffraction is `30^(@)` how many lines are there in 1 cm of the grating.

A plane transmissio grating when illuminated with normal light produces a second order diffraction at 30^(@) for wavelength lamda =500 Å. Calculate the number of lines per cm on the grating.

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?

A diffracting grating 1 cm wide has 1200 lines and is used in second order. What is the diffraction angle for light of wavelength 550 nm?

In a single slit diffraction pattern, the first minima for a wavelength lamda_(1)=6000 Å coincides with the first maxima for a wavelength lamda_(2) . Then the value of lamda_(2) is

A transparent diffraction grating has a period d = 1.50mum . Find the angular disperison D (in angular minutes per nanometers) corresponding to the maximum of highest order for a spectral line of wavelength lambda = 530mm of light falling on the grating (a) at right angles, (b) at the angle theta_(0) = 45^(@) to the normal.

A plane light wave with wavelength lambda falls normally on a phase diffraction grating whose side view is shown in Fig. The grating is cut on a glass plate with refractive index n . Find the depth h of the lines at which the intensity of the central Fraunhofer maximum is equal to zero. what is in this case the diffraction angle corresponding to the first maximum?

With light falling normally on a transparent diffraction grating 10mm wide, it was found that the components of the yellow line of sodium (589.0 and 589.6nm ) are resolved beginning with the fifth order of the spectrum. Evaluate: (a) the period of this grating, (b) what must be the width of the grating with the same period for a double lambda = 460.0nm whose components differ by 0.13nm to be resolved in the third order of the spectrum.

A 30mm wide diffraction grating produces a deviation of 30^@ in the second order principal maxima. The wavelength of light used is 600nm . The total number of slits in the grating is: