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  • A ray of light enter a rectungular glass slab of refractive index 1.5 .If its speed in air is 3×10^8 m/sec then what is the spped in glass?

A ray of light enter a rectungular glass slab of refractive index 1.5 .If its speed in air is 3×10^8 m/sec then what is the spped in glass?

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\\ we \ know \ that \ refractive \ index \ n=\frac{\text { speed of light in vacuum }}{\text { speed of light in medium }}$ \\ where $c=3 \times 10^{8} m / s$ \\ $1.5=\frac{c}{v}$ \\ $v=\frac{3 \times 10^{8}}{1.5}$ \\ $v=2 \times 10^{8} m / s$

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Deependra Verma

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