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A deviation of 2^(@) is produced in the ...

A deviation of `2^(@)` is produced in the yellow ray when prism of crown and flint glass are achromatically combined. Taking dispersive powers of crown and flint glass as 0.02 and 0.03 respectively and refractive index for yellow light for these glasses are 1.5 and 1.6 respectively. The refracting angles for crown glass prism will be ........ `@` (in degree). (Round off to the Nearest Integer)

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It is given that the aispersive powers of crown and flint glasses are 0.06 and 0.10 respectively. Also the refractive indices for yellow light for these glasses are 1.517 and 1.621, respectively. We have to form an achromatic combination of prism of crown and flint glasses which can produce a deviation of 1^(@) in the yellow ray. Evaluate the refracting angles of the two prisms needed.

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Knowledge Check

  • The dispersive powers of crown and flint glasses are 0.02 and 0.04 respectively. In an achromatic combination of lenses the focal length of flint glass lens is 40 cm . The focal length of crown glass lens will be

    A
    `-20 cm`
    B
    `+20 cm`
    C
    `-10cm`
    D
    `+10 cm`

  • The dispersive power of crown and flint glasses are 0.03 and 0.05 respectively. The refractive indices ofr yellow light for these glasses are 1.517 and 1.621 respectively .it is desired to form an achromatic combination of prism of crown and flint glasses which can produce a deviation of 1^(@) in thev yellow ray. Select right statement from the following

    A
    refracting angle of crown glass is `4.8^(@)` and that of flint glass is `2.4^(@)`
    B
    refracting angle of crown glass is `2.4^(@)` and that of flint glass is `4.8^(@)`
    C
    refacting angle of both the glasses is `4.8^(@)` each.
    D
    refacting angle of both the glasses is `2.4^(@)` each.

  • The refractive indices of crown glass prism for C, D and F lines are 1.527, 1.530 and I.535 respectively. The dispersive power of the crown glass prism is

    A
    0.01509
    B
    0.05109
    C
    0.02108
    D
    0.03402