Two narrow slits separated by 1 mm are illuminated by light of wavelength 580 nm

Question

Two narrow slits separated by 1 mm are illuminated by light of wavelength 580 nm, and the interference pattern is viewed on a screen 2.8 m away. Calculate the number of bright fringes per centimeter on the screen. (Do not round your answer to a whole number.)

Two narrow slits separated by 1 mm are illuminated by light of wavelength 580 nm, and the interference pattern is viewed on a screen 2.8 m away. Calculate the number of bright fringes per centimeter on the screen. (Do not round your answer to a whole number.) fringes/cm

Explanation / Answer

given

d = 1 mm

lamda = 580 nm

R = 2.8 m

fringe width, beta = lamda*R/d

= 580*10^-9*2.8/(1*10^-3)

= 0.001624 m

= 0.1624 cm

so, no of fringed per cm = 1/0.1624

= 6.16 fringes/cm

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