March 2, 2010
Optics 4th
Optics 4th
 UTG DS3840 4-Inch ITA Red/Green Dot Sight with 2 QD Mounts and Flip-open Lens Caps List Price:  |
 UTG 5th Gen Quick Detachable Double Rail AK Side Mount List Price: |
 Leapers 5th Gen 3-9x40 AO Mil-Dot Rifle Scope with R/G, 1 Tube Sale Price: $80.00 |
Eligible for free shipping!
 Leapers Golden Image 30mm Red/Green Dot Sight, Integral Weaver Mount List Price: |
 UTG 5th Gen 3-9X50 TS Mil-Dot Scope List Price: |
 Nikon Optics Maintenance Kit List Price: |
 UTG 5th Gen 4-16x40AO Rifle Scope, Illuminated Mil-Dot Reticle, 1/4 MOA, 1 Tube, Weaver Rings List Price: |
 NcStar Red Dot Reflex Sight/ 3/8" Dovetail Base (DP3/8) List Price: |
 UAG "QD" Quick Detach Tactical AK47 AK-47 Saiga Rifle/Shotgun 7.62x39 Side Plate Double Weaver-Picatinny Rail Scope-Sight Mount Sale Price: $27.95 |
Help with some optics questions?
1. Light in air from a laser is incident on a slab of glass with angle of incidence 30 degrees, as shown in the diagram. The index of refraction of the glass is 1.50. Sketch the reflected ray in the diagram, calculate the angle of reflection, and mark both the angle of incidence and the angle of reflection on the diagram.
http://i14.photobucket.com/albums/a304/organizedkonfusion/optics.jpg
2. Sketch the refracted ray in (1) and calculate the angle of refraction, mark it on the diagram.
3. Is it possible for total internal reflection to take place? Explain.
4. What is the critical angle for the glass in (1)
Don't expect a 'sketch' but an explanation would be best. Thanks.
1. Angle of incidence = Angle of reflection
2. Ray tracing and Snell's Law
n1 * sin(theta 1) = n2 * sin(theta 2)
1.00 * sin(30°) = 1.50 * sin(theta 2 )
3. If the internal ray hits the surface at an angle greater than the critical angle it will be internally reflected. (Fiber optics is dependent on total internal reflection!)
4. The critical angle can be calculated from Snell's law by setting the refraction angle (theta 2) equal to 90°.
The Shelter Demo (Montage) on July 4th
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