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If wavelengths of light in liquid A and B are 3500 Å and 7000 Å respectively, then critical angle of liquid A with respect to liquid B is .....

Answer»

`15^@`
`30^@`
`45^@`
`60^@`

Solution :REFRACTIVE index of A w.r.t. B, `(n_B)/(n_A)=n`
but`1/n=(v_A)/(v_B)=(lambda_Af)/(lambda_Bf)`[`because` F is constant]
`therefore1/n=(lambda_A)/(lambda_B)=(3500)/(7000)`
`1/n=1/2`
sinC=`1/2`
`therefore C=sin^(-1)(1/2)`
`thereforeC=30^@`


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