1.

For a ray refracted through a prism of angle 60^(@), thte angle of incidence is equal to angle of emergence, each equal to 45^(@). Find the refractive index of material:

Answer»

1.414
1.5
1.62
1.732

Solution :(a) I + e = A + D
1 = e = `45^(@), A = 60^(@)`
For I = e, deviation is minimum
`therefore D_(min) = 45^(@) + 45^(@) - 60^(@) = 30^(@)`
`MU=(sin""(A+D)/(2))/(sin""(A)/(2))=1.41`


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