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somecelxis
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Homework Statement
referring to the notes attached , r1 is negative beacuse it's concave to the incident light , r2 is positive bacuse it's convex to the incident light. ( incident light move from left to right. ) , but my another book states that the r1 is and r2 have the same sign , which is negative beacuse both are concave to the light ray. for r2 , assuming the light ray is traveling from right to left , so the r2 is also concave to the incident light which is also same with r1.
Which is correct? the sign for r1 and r2 shoud be different or equal ? namely (both the r1 and r2 is negative) or ( r1 is negative and r2 is positive)?