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```
Can you ever have a situation in which a light ray goes undeviated through a prism ?```
7 years ago

510 Points
```										in case of right angled isoceles prism if  a light is incident at the face AB ( prism is right angled at c) then it comes out parallel to the incident ray.....
```
7 years ago
419 Points
```										Dear Nikhil
there are two cases

refractive index for the prism and external medium is same
deviation= 2 x incidence angle - prism angle,  for deviation to be zero incidence angle = prism angle/2

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```
7 years ago
Pulkit Singhania
19 Points
```										But Deviation = 2i - angle of prism is only valid for some prisms.As when I = e angle of incidence = angle of emergence then deviation = (I+e)-angle of prism so deviation = 2i - angle of prism.Maybe when I = angle of prism/2 then I = e does not holds
```
4 months ago
Sakshi Rathore
21 Points
```										The only way Ray can pass through it undeviated if angle of incidence is zero i.e. incident Ray is perpendicular to the surface but In a prism the light Ray has to pass through two interface at an angle with each other.It can`t be perpendicular to both
```
2 months ago
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