Question

Q. Light enters from air to glass having refractive index 1.50 what is the speed of light in the glass the speed of light in vaccum is 3×10^8
​

Answer 1

Answer:

☆concept:

▪︎light gets deviates moving from one to another due to change in their velocities.

▪︎and how much that change, is measured as $\mu$(refractive index)

☆solution:

》$\mu$ = 1.5

》$\boxed{\bf{ \mu = \dfrac{c}{v}}}$

where 'c' is speed of light = 3×10⁸

and 'v' is speed of light in medium.

》$\mu = \dfrac{c}{v}$

》$1.5 = \dfrac{3×10⁸}{v}$

》$v = \dfrac{3×10⁸}{1.5}$

》$v = \dfrac{30×10⁸}{15}$

》$\bf{ v = 2×10⁸}$

so speed of light in medium is 2×10⁸.