When light enters glass from vacuum, then the wavelength of light

Options

A. decreases
B. becomes zero
C. remains same
D. Increases

Answer

A

Explanation

When a light enters glass form vacuum , then the wavelnght of light decrease.
This is because the speed of light in glass in less than that in the vacuum.
From Snell's law the refractive index in a medium is given by .
`mu = (c)/(v)`
The glass is of higher refractive index than vaccum, so speed of light decrease and as teh speed of light is drectly proportional to the wavelenght `(c -= v lambda)` , So the wavelenght also be decrease.