A crown glass prism of refracting angle 6 o is to be used for deviation without dispersion with a flint glass of angle of prism α . Given: for crown glass μ r = 1.513 and μ v = 1.523 , for flint glass μ r = 1.645 and μ v = 1.665 . What should be the value of α ?

Question

A crown glass prism of refracting angle 6 o is to be used for deviation without dispersion with a flint glass of angle of prism α . Given: for crown glass μ r = 1.513 and μ v = 1.523 , for flint glass μ r = 1.645 and μ v = 1.665 . What should be the value of α ?, 3 o, 4 o, 4.5 o, 5 o

MARKS App · Accepted Answer

⇒ μ V 1 - μ r 1 α 1 = μ V 2 - μ r 2 α 2 or ⇒ α 2 = ( 1.523 - 1.513 ) ( 1.665 - 1.645 ) 6 o = 3 o

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