MCQ
An equilateral prism deviates a ray through $40^o$ for two angles of incidence differing by $20^o$. The possible angles of incidences are :
- ✓$40^o, 60^o$
- B$50^o, 30^o$
- C$45^o, 55^o$
- D$30^o, 60^o$
✓
Answer
Correct option: A.
$40^o, 60^o$
a
$1+e-A=40^{\circ}$
$1+e-A=40^{\circ}$
$i+e=100^{\circ}\left(A=60^{\circ}\right)$
different between $I$ and e is $20^{\circ}$
So, $I$ and $e$ may be $40^{\circ}$ and $60^{\circ}$
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