For an orthogonal cutting operation, tool material is HSS, rake angle is $22^\circ$, chip thickness is $0.8 \: mm$, speed is $48 \: m/min$ and feed is $0.4 \: mm/rev$. The shear plane angle (in degrees) is

1. $19.24$
2. $29.70$
3. $56.00$
4. $68.75$