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8.4. The diffraction grating
A subsection of Physics, 9702, through 8. Superposition
Listing 10 of 66 questions
Light waves emerging from the slits of a diffraction grating are coherent and produce an interference pattern. Explain what is meant by: coherence interference. A narrow beam of light from a laser is incident normally on a diffraction grating, as shown in . 51° 51° diffraction grating screen laser light second order maximum spot second order maximum spot zero order maximum spot (not to scale) Spots of light are seen on a screen positioned parallel to the grating. The angle corresponding to each of the second order maxima is 51°. The number of lines per unit length on the diffraction grating is 6.7 × 105 m–1. Determine the wavelength of the light. wavelength = m State and explain the change, if any, to the distance between the second order maximum spots on the screen when the light from the laser is replaced by light of a shorter wavelength.
9702_w19_qp_23
THEORY
2019
Paper 2, Variant 3
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Questions Discovered
66