Figure 5 below shows the setup for Young's slits experiment to produce fringes. 1.8 m laser slits with separation 0.45 mm (measured between centres) screen Figure 5

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Chapter1: Units, Trigonometry. And Vectors
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Figure 5 below shows the setup for Young's slits experiment to produce fringes.
1.8 m
laser
slits with separation
0.45 mm (measured
between centres)
screen
Figure 5
The bright fringes result from constructive interference. Explain, in terms of "phase" and "path
difference", why there are bright fringes. Your explanation should include the suitable diagram
and appropriate concept.
Hence, calculate the wavelength of the laser light if the center of the bright fringes measured to
be at 2.4 mm apart.
In order to obtain an accurate value of the wavelength, it is better to use diffraction grating
instead of double slit. By using the suitable diagram and physics concept, discuss the reasons
for this statement.
Transcribed Image Text:Figure 5 below shows the setup for Young's slits experiment to produce fringes. 1.8 m laser slits with separation 0.45 mm (measured between centres) screen Figure 5 The bright fringes result from constructive interference. Explain, in terms of "phase" and "path difference", why there are bright fringes. Your explanation should include the suitable diagram and appropriate concept. Hence, calculate the wavelength of the laser light if the center of the bright fringes measured to be at 2.4 mm apart. In order to obtain an accurate value of the wavelength, it is better to use diffraction grating instead of double slit. By using the suitable diagram and physics concept, discuss the reasons for this statement.
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