• Support PF! Buy your school textbooks, materials and every day products via PF Here!

Wavelenght, index of refraction and speed

  • Thread starter dev-hud
  • Start date
THe wavelength of a red helium-neon laser light in air is 632.8 nm.

A) what is the frequency? ( i already figured this out to be 4.7 x 10^16)

B) what is its wavelenght in glass that has an index of refraction of 1.50?( i do not know where to or if i have to plug in the refraction into an equation and if i do what equation do i use?)

C) what is its speed in the glass? ( is this then related to question B? because i do not know how now to bring in v into the equation and what the equation is. i am just confuzed)
 
53
0
[tex]n=\frac{\lambda_0}{\lambda}[/tex]

[tex]\lambda_0[/tex] is the wavelength in air.

Part c should be easy once you have part b.
 

collinsmark

Homework Helper
Gold Member
2,723
1,065
A) what is the frequency? ( i already figured this out to be 4.7 x 10^16)
Btw, you might want to double check that. If your units are Hz, I think you are a couple orders of magnitude off.
 

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving

Hot Threads

Top