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We know that speed of light in vacuum is always constant and equal to c = 3 xx 10^(8) m//s. There is a source of light and speed of light emitted from the source is to be measured. Three different frames of refernce, namely P, Q and R, are used in the experiment. Frame of reference P is moving towards the source and R is moving away from the source with same speed. Frame of reference Q is fixed at its location. V_p, V_Q and V_R are the speeds of light as measured by the observers in corresponding reference frames. Answer the following question : Select correct option(s) if surrounding space is water everywhere

Answer»

`V_P gt V_Q gt V_R`
`V_P lt V_Q lt V_R`
`V_P = V_Q = V_R`
`V_Q = (V_P + V_R)/(2)`

Solution :When light travels in a medium then concepts of relative motion can be APPLIED. LET c. be the SPEED of light in water and `upsilon` be the speed of observer P and R. Observer P is moving TOWARDS the source and hence relative speed will become greater than actual `(c. + upsilon)` and similary observer R will observer lesser velocity `(c. - upsilon)`, because it the same DIRECTION as that of light. Observer Q will observer actual speed (c.) of light in water.


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