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Concept of projectile motion

Question Two second after projection, a projectile is moving at !!30^0!! above the horizontal; after one more second it is moving horizontally. Then: a) Angle »

Concept of prism angle

Question: A thin prism !!P_1!! of angle !!4^0!!, and made from a glass of refractive index !!1.54!!, is combined with another thin prism »