Light and Optics Light and Optics Physics Help Forum

 Jul 2nd 2009, 01:13 AM #1 Junior Member     Join Date: Jun 2009 Posts: 11 prism acc to me as we increase the refractive index r1 ie first angle of refraction will decrese so 30-r1 will increase i am not able to solve furthur plese help me Attached Thumbnails   __________________ bindaas boy.......
 Jul 2nd 2009, 04:18 AM #2 Physics Team   Join Date: Feb 2009 Posts: 1,425 Firstly extend the normals such that they meet inside the prism. Let the angle between them be A. The other two angles of this triangle are r1 and r2. Since the refractive index has increased, the ray will bend slightly more towards the normal i.e. r1 decreases to say r1’ and the ray will hit the other edge slightly lower down. Form a new triangle. The angle A remains the same as it is the angle between the two normals . Since r1’ < r1, r2’ > r2 because r1 + r2 + A = r1’ + r2’ + A = 180. We have μ’ > μ Now, R.I. μ’ = sin 30 / sin r1’ = sin e / sin r2’. Since r2’ > r2, Sin e has to increase to get the same μ’, or e > 60. Extend this ray back to find the new angle of deviation. It will be found to have increased.

 Tags prism

 Thread Tools Display Modes Linear Mode

 Similar Physics Forum Discussions Thread Thread Starter Forum Replies Last Post ling233 Thermodynamics and Fluid Mechanics 1 Feb 25th 2016 12:24 AM anshulbshah Light and Optics 1 Dec 25th 2010 08:50 AM anshulbshah Light and Optics 2 Jul 6th 2010 10:44 AM kala Advanced Mechanics 0 Dec 2nd 2008 05:46 PM