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Q. Find the focal length of the projector-lens which projects the image of size 60 × 60 cm of a slide on a screen 2.4 m away, the slide being of the size 3 × 3 cm.
Light enters a prism of angle A at a grazing incidence to emerge at an angle θ with the normal. Show that the refractive index of the material of the prism is given by,
μ = 1 + cos   A + sin   θ sin   A 2 1 2

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