1. The figure on the right shows the interference pattern on a screen 2.0 m behi

Question

1. The figure on the right shows the interference pattern on a screen 2.0 m behind a 400 line/mm diffraction grating. What is the wavelength (in nm) of the light?(A sketch of the system must be included for full credit.) Intensity 897 cm89.7 cm 43.6 can 43.6cm 2. The figure shows the light intensity on a screen behind a double slit. The slit spacing is 0.15 mm and the wavelength of the light is 550 nm. (a) What is the distance from the slits to the screen? (b) Suppose one slit is covered. What will be the light intensity at the center of the screen due to the remaining slit? (For this last part, sketches and explanations are sufficient. You do not need to calculate an exact number.. Intensity (mW/) 12 2.0 cm

Explanation / Answer

Problem 1)

d sin =

d = 1/400 mm = 2.5 x 10^-6

tan = 43.6/200 = 0.218

=> = 12.298 degrees

sin = 0.213

=> = 2.50 x 10^-6 x 0.213 532.50 nm

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