A crown glass prism with refractive index 6 is to be achromatized for red and blue color light with flint glass prism. What will be the angle of flint glass prism? ( r = 1.513, r = 1.645, 2 = 1.523 and 2 = 1.665, Where r and 2 are refractive indices of red and blue light respectively whereas, r and 2 are refractive indices of red and blue light respectively for flint glass.)

A crown glass prism with refractive index 6 is to be achromatized for

1.	A crown glass prism with refractive index 6 is to be achromatized for red and blue color light with flint glass prism. What will be the angle of flint glass prism? ( _r = 1.513, _r = 1.645, ₂ = 1.523 and ₂ = 1.665, Where _r and ₂ are refractive indices of red and blue light respectively whereas, _r and ₂ are refractive indices of red and blue light respectively for flint glass.)
A.	1.5
B.	2.4
C.	3
D.	4.5
Answer» D. 4.5

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