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If a glass prism is dipped in water, its...

If a glass prism is dipped in water, its dispersive power

A

increases

B

decreases

C

does not change

D

may increase or decrease depending on whether the angle of the prism is less than or greater than `60^(@)`

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A prism has R.I.for violet and red n_(v) =1.523 n_(r)=1.5145 If the angle of prism is A=2 ^ @ the dispersive power of the prism is :

In a direct vision spectroscope there are two flint glass prisms each of angle 5^(@) and dispersive power 0.36 and two crown glass prisms of dispersive power 0.24. Calculate the angle of each crown glass prism and the net dispersion produced by the system of prisms. (mu_("crown")=1.5 and mu_("flint")=1.68)

Knowledge Check

  • If a glass prism in dipped in water its dispersive power

    A
    increases
    B
    decreases
    C
    does not change
    D
    may increase or decrease depedig on whether the angle of the prism is less than or greater than `60^@`

  • When a glass prism is placed inside water, its dispersive power______

    A
    decreases
    B
    ramains the same
    C
    increases
    D
    may increase or decrease depending on refracting angle of prism

  • Assertion: When a glass prism is immersed in water, the devitation caused by prism decreases. Reason: Refractive index of glass prism relative ot water is less than that relative to air.

    A
    Assertion is True, Reason is True, Reason is a correct explantion for Assertion
    B
    Assertion is True, Reason is True, Reason is not a correc explanation for Assertion
    C
    Assertion is True, Reason is False
    D
    Assertion is False, Reason is False.

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    Calculate the dispersion and deviation ( mean) produced by a flint glass prism placed in the position of minimum deviation with respect to the mean colour. The angle of prism is 60^(@) . Also calculate the dispersive power of the prism. Index of refraction of flint glass for blue light=0.667 and that for the red light =1.643.

    In a direct vision sperctroscope there are four crown glass prisms of angle 5^(@) each and three flint glass prisms. The dispersive powers of crown and flint glass are 0.03 and 0.05, repectively and their refractivities ar 0.518 and 0.655. Calculate the dispersion produced and the angle of the flint glass prisms required for no deviation.

    STATEMENT- 1 When a glass prism is Immesed in water ,the deviation caused by prism decreases. STATEMENT 2 Refractive index of glass prism relative to water is less than relative to air.

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    In an achromatic combination of two prisms, the ratio of the mean deviations produced by V the two prisms is 2:3, the ratio of their dispersive power is

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