Saved Bookmarks
| 1. |
For right-angled prism, ray-1 is the incident ri and ray-2 is the emergent ray as shown in the figure. Refractive index of the prism is ......... |
|
Answer» `(1)/(sqrt2)` `therefore`At point D, angle of INCIDENCE formed with perpendicular MN on surface AB is EQUAL to CRITICAL angle C = `45^@` `n=(1)/(sinC)=(1)/(SIN45^@)=(1)/(0.7071)=1.414=sqrt2` It is clear from the figure that ray experience: total internal reflection at points D and E. A these points value of angle of incidence is `45^@` `therefore45^@ gt C` (critical angle) `implies sin 45^@ gt sin Cimplies (1)/(sqrt2) gt 1/n implies n ge sqrt2` Out of given option for `n ge sqrt2,n=sqrt2` |
|