A glass-slab is immersed in water. What will be the crirtical angle for a light ray at glass-water interface? Where `_(a)n_(g)=1.50,_(a)n_(w)=1.33 and sin^(-1)(0.887)=62.5`A. `48.8^(@)`B. `72.8^(@)`C. `62.5^(@)`D. `64.5^(@)`

A glass-slab is immersed in water. What will be the crirtical angle fo

1.	A glass-slab is immersed in water. What will be the crirtical angle for a light ray at glass-water interface? Where `_(a)n_(g)=1.50,_(a)n_(w)=1.33 and sin^(-1)(0.887)=62.5`A. `48.8^(@)`B. `72.8^(@)`C. `62.5^(@)`D. `64.5^(@)`
Answer» Correct Answer - C (c ) The refractive index of glass relative to water is given by, `""_(w)n_(g)=(""_(a)n_(g))/(""_(a)n_(w))=1.50/1.33` If C be the crirical angle at glass water interface, then `Sin C=(1)/(""_(w)n_(g))=1.33/1.50=0.8867` `C=sin_(.)^(-1)(0.8867)=62.5`

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A glass-slab is immersed in water. What will be the crirtical angle for a light ray at glass-water interface? Where `_(a)n_(g)=1.50,_(a)n_(w)=1.33 and sin^(-1)(0.887)=62.5`A. `48.8^(@)`B. `72.8^(@)`C. `62.5^(@)`D. `64.5^(@)`

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