The first to the right shows the light intensity on a screen 2.5 m behind an ape

Question

The first to the right shows the light intensity on a screen 2.5 m behind an aperture. This intensity corresponds to the fringe pattern created. The aperture is illuminated with light of wavelength 600 nm. Is the aperture a diffraction grating or a double slit? Explain how you know. Draw a sketch for the aperture you've chosen. Derive equations and state all approximations. If the aperture is a diffraction grating, how many lines/cm does it have? If it is a double slit, what is the spacing between the slits?

Explanation / Answer

a) The aperture is a double slit .

This is because of decrease in intensity on either sides of graph .

b)     Here, d * sin(theta) = n * lambda

     =>     d * (x/D) = n * lambda

c)    Here,    d * (0.025/2.5) = 3 * 600 * 10-9

=> d = 0.18 mm

=>    spacing between the slits = 0.18 mm

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.