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Calculate the angle of a prism of disper...

Calculate the angle of a prism of dispersive power `0.021` and refractive index `1.53` to form an achromatic combination with prism of angle `4.2^@`, and dispersive power `0.045`, having refractive index `1.65`. Find also the net deviation.

A

`1.12^(@)`

B

`2.16^(@)`

C

`3.12^(@)`

D

`4.18^(@)`

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