`i_(1)=r_(1)=45^(@)`
`i_(2)=r_(2)=15^(@)`
Glancing angle at `M_(1)=90-i_(1)=90-45^(@)`
`" "=45^(@)`
Glancing angle at `M_(2)=90-i_(2)=90-15`
`" "=75^(@)`
Angle of deviation at `M_(1)=180-2i_(1)=90^(@)`
Angle of deviation at `M_(2)=180-2i_(2)=150^(@)`