A parallel beam of light (λ = 5000 Å) is incident normally on a narrow slit of width 0.2 mm. The Fraunhofer diffraction pattern is observed on a screen placed at the focal plane of a convex lens (f = 20 cm). The first two minima are separated by (A) 0.005 cm (B) 0.05 cm (C) 2.5 mm (D) 5 mm.

A parallel beam of light (λ = 5000 Å) is incident normally on a narr

1.	A parallel beam of light (λ = 5000 Å) is incident normally on a narrow slit of width 0.2 mm. The Fraunhofer diffraction pattern is observed on a screen placed at the focal plane of a convex lens (f = 20 cm). The first two minima are separated by (A) 0.005 cm (B) 0.05 cm (C) 2.5 mm (D) 5 mm.
Answer» Correct option is (B) 0.05 cm

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A parallel beam of light (λ = 5000 Å) is incident normally on a narrow slit of width 0.2 mm. The Fraunhofer diffraction pattern is observed on a screen placed at the focal plane of a convex lens (f = 20 cm). The first two minima are separated by (A) 0.005 cm (B) 0.05 cm (C) 2.5 mm (D) 5 mm.

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