Saved Bookmarks
| 1. |
A light ray is incident on lower medium boundary at an angle `30^(@)` with the normal. Which of following statement is/are true ? A. If `mu_(2) gt 2` then total deviation is `60^(@)`B. If `mu_(2) lt 2` then total deviation is `60^(@)`C. If `mu_(2) gt 2` then total deviation is `120^(@)`D. If `mu_(2) lt 2` then total deviation is `120^(@)` |
|
Answer» Correct Answer - A::D For refraction `mu_(1) sin 30^(@) = mu_(2) sin theta = mu_(3) sin e` `rArr 2 = mu_(2) sin theta = 2 sin e` For emergence through B `sin theta lt 1` `2 lt mu_(2), e= 90^(@)` `D = 90^(@) - 30^(@) = 60^(@)` If `mu_(2) lt 2` ray will suffer TlR on A `D = 180^(@) -2 xx 30^(@) = 120^(@)`. |
|