In a parabola spectrograph, the velocities of four positive ions $P,Q,R$ and $S$ are $v_1$, $v_2$, $v_3$ and $v_4$ respectively

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  • A

    ${v_1} > {v_2} > {v_3} > {v_4}$

  • B

    ${v_1} < {v_2} < {v_3} < {v_4}$

  • C

    ${v_1} = {v_2} = {v_3} = {v_4}$

  • D

    ${v_1} < < {v_2} > {v_3} < {v_4}$

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