A) \[{{40}^{o}}\]
B) \[{{60}^{o}}\]
C) \[{{70}^{o}}\]
D) \[{{90}^{o}}\]
Correct Answer: D
Solution :
[d] When angle of incidence is \[{{i}_{1}},\,\,e={{40}^{o}}\] (from reversibility of ray) also \[\delta ={{70}^{o}}\] |
\[\Rightarrow \] \[{{70}^{o}}={{i}_{1}}+{{40}^{o}}-A\Rightarrow {{i}_{1}}={{90}^{o}}\] |
You need to login to perform this action.
You will be redirected in
3 sec