Question

i) In which substance speed of light is more? ​

Answer 1

Answer:

the speed of light is more in vaccum

Answer 2

Answer:

Light travels at approximately 300,000 kilometers per second in a vacuum, which has a refractive index of 1.0, but it slows down to 225,000 kilometers per second in water (refractive index of 1.3; see Figure 2) and 200,000 kilometers per second in glass (refractive index of 1.5).