Refraction in Prism Introduction
Greetings! I am your instructor - Udit Gupta This is the 1st lesson in this course on prisms. We get an idea about prisms and use basic laws of refraction to get a fair idea about prism. It is basically refraction in plane surface done twice. Don't forget to check the Special Classes!
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What is a prism? It is a solid figure having two triangular bases and three rectangular surfaces and is the closed surface. The angle between each surface is the angle of the prism. Here the opposite surfaces are equal surfaces and are parallel. We notice that here there are two refracting surfaces which means the surface where refraction of light takes place.
Refraction through a prism A light ray striking at one face of a triangular prism gets refracted twice and emerges out from the other face as shown The angle between the emergent and the incident rays is called the angle of deviation (D) The angle between the two refracting surfaces is called the refracting angle (A) of the prism From AXY, A (90 r1(90 2) 180 emergent ray Incident ray
Refraction through a prism Deviation: D=(1-r1) + (e-T2) D=(ite) _ (n +T2) emergent ray Incident ray A + D = 1 + e From the two equation from Snell's law at X and Y, sin r2 1 sin e sin i = & sin r1
Angle of Deviation . It can be easily seen that if we reverse the emergent ray, it goes back along the same path. The angles of incidence and emergence get interchanged but the angle of deviation remains same 02 Angle of incidence e, Angle of emergence- 62 Angle of incidence-8, Angle of emergence- e Hence the same angle of deviation D is possible for two different angles of incidence:01 & 2 where, +92-A + D
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A Mechanical Engineer from NIT Allahabad here to help learners with physics. Also a Star ⭐ educator.