If white light is used in Young’s double-slit experiment
a) bright white fringe is formed at the centre of the screen
b) fringes of different colours are observed on both sides of central fringe clearly only in the first order
c) the first order violet fringe’s are closer to the centre of the screen than the first order red fringes
d) the first order red fringes are closer to the centre of the screen than the first order violet fringes

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only a and d are true

only a and b are true

only a,b and c are true

all are true

answer is C.

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Detailed Solution

bright central fringe is formed due to all the colors
fringes of different colors are observed clearly only in the first order as after that dispersion becomes less
the first-order violet fringes are closer to the center of the screen than the first-order red fringes as the wavelength of violet is small .
option A,B,C are correct

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