1.

A glassplate the thickness t and ref. index mu.At what angle of incidence (from air), the reflected and refracted rays by plate be perpendicular to each other:

Answer»

`sin^(-1) mu`
`cos^(-1) mu`
`COT^(-1) mu`
`TAN^(-1)mu`

Solution :(d) Here I + r = `90^(@)`
By LAW of refraction `mu = (sin i)/(sin r)`
`thereforemu=(SINI)/(sin(90-i))=(sini)/(cosi)=tani`
`therefore I = tan^(-1) mu`


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