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Find the angle of flint glass prism whic...

Find the angle of flint glass prism which produces the same angular dispersion for `c` and `F` wavelengths in `10^(@)` crown glass prism.
For crown glass : `mu_(F) = 1.5230, mu_( c) = 1.5145`
For flint glass : `mu'_(F) = 1.6637, mu'_( c) = 1.6444`.

Text Solution

Verified by Experts

The correct Answer is:
`4.4^(@)`
As angular dispersion is same.
`:. (mu'_(F) - mu'_(c ))A' = (mu_(F) -mu_( c))A`
`(1.6637 - 1.6444)A' = (1.5230 - 1.5145) xx 10^(@)`
`A' = (0.0085 xx 10)/(0.0193) = 4.4^(@)`
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Calculate the dispersive power for crown and flint glass prism from the following data :For crown glass, m_(b) = 1.522, m_(r ) = 1.514 . For flint glass, mu'_(b) = 1.662, mu'_(r ) = 1.644

Calculate the dispersive power for crown and flint glass prisms from the following data : For crown glass, m_b = 1.522 , m_r = 1.514 . For flint glass, mu'_b = 1.662 , mu'_r = 1.644 .

Knowledge Check

  • A crown glass prism with refracting angle 5° is to be achromatised for red and blue light with flint glass prism. Angle of the flint glass prism should be ( Given for grown glass mu_(r) -1.513, mu_(b) = 1.523, for flint glass mu_(r)=1.645,mu_(b)=1.665 )

    A
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    B
    3°
    C
    2.4°
    D
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  • The net angular dispersion produced without deviation for crown glass (mu = 1.56) and flint glass ( mu = 1.7) is

    A
    positive
    B
    zero
    C
    negative
    D
    infinite

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