Sunday

October 26, 2014

October 26, 2014

Posted by **Joseph** on Sunday, March 7, 2010 at 11:26pm.

1. The index of refraction for a prism is given by the equation:

n = 1.58 − (6.41 x 10^4)λ

where λ is the wavelength in meters. Light is incident at 28°.

Find the exit angle ß for light of

a) 800 nm

b) 633 nm

c) 540 nm

2. Will lower wavelengths be allowed to exit the prism? Why or why not?

- Physics -
**drwls**, Monday, March 8, 2010 at 8:04amUse the given wavelength to compute the refractive index at that wavelength, then use Snell's law (twice) to get the refraction angles in and out. You have not said what the angle of the prism is. Shall we assume the cross section is an equilateral triangle? You need to know it when computing the exit angle.

At a wavelength of 540*10^-9 m, the refractive index is 1.545. That is not a lot different from the value at 800 nm, but different enough to disperse a good spectrum. Light incident at any angle will be able to enter the prism, and will find a way to get out somehow.

**Answer this Question**

**Related Questions**

physics - Horizontal rays of red light (λ = 660 nm, in vacuum) and violet ...

probability - lengths of the different pieces are independent, and the length of...

Solar - Greeting All, please assist with the below. Thanks. The spectral power ...

Stats - For X ∼ Poi(λ), show that E(X) = λ and V ar(X) = λ...

Probability - A single dot is placed on a very long length of yarn at the ...

probability - The lifetime of a type-A bulb is exponentially distributed with ...

Physics - A long thin rod lies along the x-axis from the origin to x=L, with L= ...

Physics - A long thin rod lies along the x-axis from the origin to x=L, with L= ...

Physics - Which of the following equations describes the condition for observing...

Physics - please help!!.. - A long thin rod lies along the x-axis from the ...