A screen is at a distance D=80 cm from a diaphragm having two narrow slits S1 and S2 which are d=2 mm apart. Slit S1 is covered by a transparent sheet of thickness t1=2.5 μm and slit S2 is covered by another sheet of thickness t2=1.25 μm as shown in figureBoth sheets are made of same material having refractive index μ=1.40. Water is filled in the space between diaphragm and screen. A monochromatic light beam of wavelength λ=5000 ˙A is incident normally on the diaphragm. Assuming intensity of beam to be uniform, calculate ratio of intensity at C to the maximum intensity of interference pattern obtained on the screen (μw=43).

A screen is at a distance D=80 cm from a diaphragm having two narrow s

1.	A screen is at a distance D=80 cm from a diaphragm having two narrow slits S1 and S2 which are d=2 mm apart. Slit S1 is covered by a transparent sheet of thickness t1=2.5 μm and slit S2 is covered by another sheet of thickness t2=1.25 μm as shown in figureBoth sheets are made of same material having refractive index μ=1.40. Water is filled in the space between diaphragm and screen. A monochromatic light beam of wavelength λ=5000 ˙A is incident normally on the diaphragm. Assuming intensity of beam to be uniform, calculate ratio of intensity at C to the maximum intensity of interference pattern obtained on the screen (μw=43).
Answer» A screen is at a distance $D = 80 cm$ from a diaphragm having two narrow slits $S_{1}$ and $S_{2}$ which are $d = 2 mm$ apart. Slit $S_{1}$ is covered by a transparent sheet of thickness $t_{1} = 2.5 μ m$ and slit $S_{2}$ is covered by another sheet of thickness $t_{2} = 1.25 μ m$ as shown in figure Both sheets are made of same material having refractive index $μ = 1.40$ . Water is filled in the space between diaphragm and screen. A monochromatic light beam of wavelength $λ = 5000 ˙ A$ is incident normally on the diaphragm. Assuming intensity of beam to be uniform, calculate ratio of intensity at $C$ to the maximum intensity of interference pattern obtained on the screen $(μ_{w} = \frac{4}{3})$ .

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