1.

When a ray of light enter from one medium to another, its velocity is doubled. The critical angle for the ray for two internal reflection will be

Answer»

`30^(@)`
`60^(@)`
`90^(@)`
Informatino is incomplete

Solution :`MU=(1)/(sini_(c))=(v_(1))/(v_(2))=(2v_(2))/(v_(2))=2,sini_(c)=(1)/(2)thereforei_(c)=30^(@)`


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