Answer:
Option b. is true
Explanation:
- Light travel slower in glass than in air because of glass is denser than air and its refractive index is more than that of air. Therefore, except air, light travels slower in any other medium
Other options are not correct like
When an electromagnetic wave enters a new medium it speed as well as wavelength changes but frequency does not change.
I think the answer is Allele am not so sure of it and sorry if my answer is wrong or didn’t help okay
Answer:
2.5
Explanation:2.5 +2.5 = 5.0