Answer :

(a) The speed of light in vacuum i.e. 3 × 108 m/s is universal constant and thus, it’s value stays the same in vacuum as there are no interacting particles, It is not effected by (i) the nature of the source, (ii) Direction of propagation (iii) Motion of the source or observer (iv) Wavelength and (v) Intensity of the wave.


Thus, the given factors will have no effect on the speed of light in vacuum.


(b) Since, the factors such as (i) the nature of the source (ii) the direction of propagation (iv) wavelength change the intrinsic property of the light but other factors given are external factors and does not affect the propagation property of light. Thus, The speed of light in a medium like glass or water is influenced only by (i) (ii), (iv).


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