QJEEAdv05Ma75bd: JEE Advanced 2005 Physics - Class 11 JEEAdv05Ma75bd Solution: If the incident ray on a surface is along the unit vector the…

If the incident ray on a surface is along the unit vector $\widehat v\,\,,$ the reflected ray is along the unit vector $\widehat w\,\,$ and the normal is along unit vector $\widehat a\,\,$ outwards. Express $\widehat w\,\,$ in terms of $\widehat a\,\,$ and $\widehat v\,\,.$