(1) sin-1 [√2 sin15°] and {π/6 + sin-1 [√2 sin 15°]}
For the ray, incident at grazing incidence, on one face, the corresponding angle of refraction, r1 , would be given by
![](https://www.sarthaks.com/?qa=blob&qa_blobid=4004618922184402357)
If angle of incidence, at the second face, is r2 , we would have
![](https://www.sarthaks.com/?qa=blob&qa_blobid=14576766586679513568)
∴ If e is the angle of emergence, we have
![](https://www.sarthaks.com/?qa=blob&qa_blobid=528699234820324510)
Also, if D is the angle of deviation, we have
![](https://www.sarthaks.com/?qa=blob&qa_blobid=1183034272114039072)