Question

Define refraction of light. What will if refraction will occur from Denser medium to Rarer medium with diagram. ​

Answer 1

Answer:

refraction is the change in direction of a wave passing from one medium to another or from a gradual change in the medium. Refraction of light is the most commonly observed phenomenon, but other waves such as sound waves and water waves also experience refraction.

Explanation:

When a wave goes from a denser into a rarer medium, its speed increases. Since frequency n does not change, the wavelength λ=v/n increases. There is no phase change on refraction

Answer 2

Answer:

Refraction is the change in direction of a wave passing from one medium to another or from a gradual change in the medium. 

I dont know the answer for the second question. Sorry.