A thin prism with an angle of 3^o and made from glass of refractive index 1.15 is combined with another prism made from glass and has a refractive index of 1.45. If the dispersion were to occur without deviation then what should be the angle of the second prism?(a) 3^o(b) 0^o(c) 1^o(d) 2^oThis question was posed to me by my school teacher while I was bunking the class.Query is from Ray Optics topic in division Ray Optics and Optical Instruments of Physics – Class 12

A thin prism with an angle of 3^o and made from glass of refractive in

1.	A thin prism with an angle of 3^o and made from glass of refractive index 1.15 is combined with another prism made from glass and has a refractive index of 1.45. If the dispersion were to occur without deviation then what should be the angle of the second prism?(a) 3^o(b) 0^o(c) 1^o(d) 2^oThis question was posed to me by my school teacher while I was bunking the class.Query is from Ray Optics topic in division Ray Optics and Optical Instruments of Physics – Class 12
Answer» Right ANSWER is (C) 1^o The best I can EXPLAIN: The required equation ➔ δ=(μ-1)A When two prisms are combined, then: δ=δ+δ’=(μ-1)A+(μ’-1)A’=0 So, A’=-\(\frac {(\mu-1)A}{\mu^{‘}-1}\) A’=-\(\frac {(1.15-1)}{1.45-1}\) × 3 A’=-1^o Therefore, the angle of the other prism is 1^o and OPPOSITE of the first prism.

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