Two narrow slurs see 0.025 mm apart. When a laser shines on them, bright fringes

Question

Two narrow slurs see 0.025 mm apart. When a laser shines on them, bright fringes form on a screen that is 2 meters away. The fringes are 3.0 cm apart. A) what is the seperatook between the second order bright fringe and the central fringe? B) what is the wavelength of the light? Two narrow slurs see 0.025 mm apart. When a laser shines on them, bright fringes form on a screen that is 2 meters away. The fringes are 3.0 cm apart. A) what is the seperatook between the second order bright fringe and the central fringe? B) what is the wavelength of the light? A) what is the seperatook between the second order bright fringe and the central fringe? B) what is the wavelength of the light?

Explanation / Answer

We know

beta = lambda * D/d

or, lambda = wavelength = 3*10^-2*0.025*10^-6/2

= 3.75*10-10 m

seperatook between the second order bright fringe and the central fringe = 2*3 = 6 cm

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