1.

In a double slit experiment, when light of wavelength 400 nm was used, the angular width of the first minima formed on a screen placed i m away was found to be 0.2^(@). What will be the angular width of the first minima if the entire experimental apparatus is immersed in water (u_("water")=4//3)

Answer»

`0.1^(@)`
`0.266^(@)`
`0.15^(@)`
`0.05^(@)`

Solution :`THETA=(lambda)/(d) and theta=(lambda)/(d) "but" MU=(lambda)/(lambda.) RARR lambda.=(lambda)/(mu)`
and `(theta.)/(theta)=(lambda.)/(lambda)=(lambda)/(mulambda)=(1)/(mu)`
`theta.=(theta)/(mu)=(0.2)/((mu)/(3))=(0.6)/(4)=0.15^(@)`


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