The wavelength of red helium-neon laser light in air is 632.8 nm.
(a) what is its frequency?
(b) what is its wavelength in glass that has an index of refractionof 1.48?
(c) what is its speed in the glass?

(a)

The frequency of an electromagnetic wave is given by:

where

is the speed of the wave in a vacuum (speed of light)

is the wavelength

In this problem, we have laser light with wavelength

. Substituting into the formula, we find its frequency:

(b) 427.6 nm

The wavelength of an electromagnetic wave in a medium is given by:

where

is the original wavelength in a vacuum (approximately equal to that in air)

is the index of refraction of the medium

In this problem, we have

n = 1.48 (index of refraction of glass)

Substituting into the formula,

(c)

The speed of an electromagnetic wave in a medium is

where c is the speed of light in a vacuum and n is the refractive index of the medium.

Since in this problem n=1.48, we find

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles

as we probably am aware that our atmosphere or air have various levels, each level has different gasses, and each gas has another porousness. at the point when the light originates from lower porousness to higher penetrability, it alters its course. with the goal that implies that when the light originates from the moon to the earth, it alters it's course a lot more occasions. it essentially implies that the state of the light piece of the moon is changed on the earth.

not copied too! hope this !

joke:

h o h o hope you have a merry christmas!