Question

question 6) A 501.0-nm light source illuminates two slits with a separation of 6.00 ✕ 10⁻⁴ m, forming an interference pattern on a screen placed 4.30 m away from the slits. At a point a distance of 3.85 mm from the central maximum, what are the following?

(b) the intensity compared to that of the central maximum

Question 7) In a Young's double-slit experiment, 610-nm-wavelength light is sent through the slits. The intensity at an angle of 2.80° from the central bright fringe is 85% of the maximum intensity on the screen. What is the spacing between the slits?

Question 6 part b and question 7

Answer 1

6)

(b)

Intensity of light at the central maximum on the screen is

Intensity of light at any point on the screen is given by

Where phase

is the distance from central maximum to point where the intensity is to be found,

For small angles

and

Intensity at a point at a distance from central maximum

Intensity compared intensity at central maximum is

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7)

Spacing between the slits is

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