The Diffraction Grating (CIE A Level Physics)

A beam of monochromatic light with a wavelength of 690 nm is directed at a diffraction grating with 300 lines per mm as shown in the diagram

This set up produces a series of maxima on the screen, what is the greatest number of maxima that can be observed?

Monochromatic light with a wavelength of 600 nm is observed through a diffraction grating with 500 lines per mm.

The light is first passed through a narrow slit where the lines from the slit are parallel to the lines in the grating.

The observer changes position to; R – parallel with the grating, S – opposite the slit, T – parallel to the grating on the opposite side.

What is the total number of images they would see from R, S and T combined?

A student set up an experiment with a diffraction grating. They put a narrow beam of monochromatic light incident along the normal. They found that the third-order diffracted beams are formed at angles of 45° to the original direction.

Which of the following gives the highest order of diffracted beam produced by this grating ?

The wavelength of monochromatic light can be determined using a diffraction grating. This is shown in the diagram.

The angle between the first-order diffraction maxima is 60°, and the spacing of the slits is 1.15 × 10^–6 m.

 What is the wavelength of the light?

When a parallel beam of white light is incident to normally on a diffraction grating the second-order and third-order spectra partially overlap.

 When the second order wavelength is 600 nm, which of the following third-order wavelengths would appear at the same angle?

Yellow light with a wavelength of 600 nm is used in a diffraction grating experiment. The grating has a slit separation of 2.00 μm.

What would be the angular separation between the first order and second order maxima?

An experiment was set up to investigate light passing through a diffraction grating with slit spacing d. The fringe pattern was observed on a screen.

Which of the following gives the angle between the two first-order lines?

A student carried out an experiment on monochromatic light with a wavelength of 5.30 × 10^–7 m. They set up the source so that it was incident normally to the diffraction grating.

The student observed that the first-order maximum of was 15.4° to the direction of the incident light.

 What would be the angle between the first order and second order maxima?

A monochromatic light beam is incident normally to a double slit and nine maximas are observed on the screen.

What is the range for the angle θ between the central and first-order maxima?

Fig. 1.1 shows a monochromatic light beam which is incident normally to a double slit. The angle between the central and second-order maxima is 18°.

Fig. 1.1

What is the angle between the two third-order maxima lines?