Saved Bookmarks
| 1. |
The refracting angle of a prism is A and refractive index of the material of prism is `cot(A//2)` . The angle of minimum deviation will beA. `180^(@) - 3A`B. `180^(@)+2A`C. `90^(@)-A`D. `180^(@)-2A` |
|
Answer» Correct Answer - D `cot.(A)/(2) = (sin((delta_("min)+A)/(2)))/(sin((A)/(2)))` `cos.(A)/(2) = sin ((delta_("min")+A)/(2))` `sin((pi)/(2)-(A)/(2)) = sin ((delta_("min")+A)/(2))` `rArr (pi)/(2)-(A)/(2) = (delta_("min"))/(2)+(A)/(2)` `= (pi)/(2)-A = (delta_("min"))/(2)` `Delta_("min") = pi - 2A` |
|