1.

When a ray of light enters into the medium of refractive index of mu, angle of refraction is half of angle of incidence so angle of incidence = ......

Answer»

`2sin^(-1)(MU/2)`
`2cos ^(-1)(mu)`
`cos^(-1)(mu/2)`
`2cos^(-1)(mu/2)`

Solution :`mu =SINI/sinr=(sini)/(sini//2)`
`=(2sin""1/2cos""1/2)/(sin""i/2)`
`THEREFORE mu =2cos""i/2`
`therefore mu/2=cos""i/2`
`i/2=cos^(-1)(mu/2)`
`therefore i= 2cos^(-1)(mu/2)`


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