A laser beam is shone on a horizontal slab of 4 cm-thick glass (n = 1.4) at a 34-degree angle from the normal. By how much will the light ray be

A laser beam is shone on a horizontal slab of 4 cm-thick glass (n = 1.4) at a 34-degree angle from the normal. By how much will the light ray be shifted from along the glass slab upon exiting it? (How far is the distance between the point where the laser beam leaves the glass slab and where it would have left it if the slab had an index of refraction n = 1)? in cm