question_answer

Light enters from air into a glass plate having refractive index 2. What is the speed of light in glass? (The speed of light in vacuum is \[3\times l08\text{ }m/s\]).

A) \[2\times {{10}^{8}}\text{ }m/s\]                     

B) \[3\times {{10}^{5}}\text{ }m/s\]

C) \[1.5\times {{10}^{8}}\text{ }m/s~~~~\]        

D) \[1.8\times {{10}^{5}}\text{ }m/s\]

E) None of these