Q. 9

# A thin prism of crown glass (μ_{r}=1.515, μ_{v} =1.525) and a thin prism of flint glass ((μ_{r}=1.612, μ_{v} =1.632) are placed in contact with each other. Their refracting angles are 5.0° each and are similarly directed. Calculate the angular dispersion produced by the combination.

Answer :

Given that,

Refractive index of crown glass red light = μ_{r}=1.515,

And for violet light = μ_{v} =1.525

Refractive index of flint glass red light = μ_{r}=1.612,

And for violet light = μ_{v} =1.632

Refractive Angle= 5^{0}

Now,

Since, they are similarly directed, the total deviation produced is given by,

So, angular dispersion of the combination is given by,

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A thin prism of crown glass (μ_{r}=1.515, μ_{v} =1.525) and a thin prism of flint glass ((μ_{r}=1.612, μ_{v} =1.632) are placed in contact with each other. Their refracting angles are 5.0° each and are similarly directed. Calculate the angular dispersion produced by the combination.

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