1)Light wave can interfere with each other but they require some additional cond
ID: 1450512 • Letter: 1
Question
1)Light wave can interfere with each other but they require some additional conditions. The must be ? and they must have the same ? .
2)A single slit diffraction pattern is observed on a screen. The distance from the slit to the screen is 0.8m. The distance from the central maximum to the first minimum is 0.9 cm. We know the wavelength of the laser light is 632nm. What is the width of the slit in mm?
3)A single slit diffraction pattern is observed on a screen. The width of the slit is 0.02 mm. The distance from the slit to the screen is 1 m. If the wavelength of the laser light is 632.8 nm. How far is the third minimum from the central maximum in cm?
4)A single slit diffraction pattern is observed on a screen. The width of the slit is 0.02 mm. The distance from the slit to the screen is 1 m. If the wavelength of the laser light is 532 nm. How far is the second minimum to the first minimum in cm?
Explanation / Answer
1. in the first question light wave interference when (a) the phase difference between two waves must constant
(b) the frequency of both waves should be equal
2. here D=0.8m d=0.9m lemda=632nm
x=lemda*D/d
=632*10^-9*0.8/0.9
=561.77*10^-9*10^3
561.77*10^-6 Ans
3. here a=0.02mm d=1m lemda=632.8nm
distance=n*lemda*d/a
=3*632.8*1/0.02
=94920*10-4 Ans
4. here a=0.02mm d=1m lemda=532nm
distance= 2*532*1/0.02
=53200*10-4 Ans
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