11 Interference monochromatic fringes are produced by light falling normally on wedge shaped film of cellophane whose refractive

Question

11 Interference monochromatic fringes are produced by light falling normally on wedge shaped film of cellophane whose refractive index is 1 4 The angle of wedge is 20 sec of an arc and distance between successive fringes is 0 25 cm Calculate wavelength of light 1 Point

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