Question

in a arrangement for fraunhofer diffraction we use a slit of width 0.2 mm and first minimum is at 5mm on either side of central maximum . if the distance between the lens and the screen is 2 mm , calculate the wave length of light ?​

Answer 1

2λDd = 2 × 5 × 103 × 10-10 × 22 × 10-1 × 10-3 = 10 × 10-710-4 = 10-2m....✌️✌️

Answer 2

Explanation:

d=0.2mm

D=2mm

y=5mm

n=1

we know

y=(2n-1)/2 × lemdaD/d

5mm=1/2×lemda 10

lemda=1mm

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