A parallel beam of light falls normally on the first face of a prism of small anlge A. At the second face it is partly transmitted partly reflected. The reflected beam striking the first face again, emerges out through the first face at an angle of `6^(@)30'` with the normal to the first face. The refracted beam is found to hae undergone a deviation of `1^(@)15'` from the original direction.
Calculate the refractive index and angle of the glass prism .

Answer

n = 2; A = `1^(@) 30'`