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A-direct- vision prism is made out of th...

A-direct- vision prism is made out of three prisms, each with a refracting angle of `60^(@)`. Attached to each other as shown in the figure. Light of a certain wavelength is incident on the first prism. The angle of incidence is `30^(0)` and the ray leaves the third prism parallel to the direction of incidence. The refractive index of the glass of the first and third prism is 1.5 Find the refractive index of the matterial of the middle prism `(sqrt(6)=2.45)`

A

`1.95`

B

`2.96`

C

`2.84`

D

`3.95`

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