During orthogonal cutting of MS with a 10 deg rake angle

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During orthogonal cutting of MS with a 10 deg rake angle tool, the chip thickness ratio was obtained as 0.4. The shear angle (in degrees) evaluated from this data is

1. 6.53
2. 20.22
3. 22.94
4. 50.00

Correct Option: C

tanφ =	rcosα
	1 - rsinα

where, r = 0.4 and α = 10°

∴ tanφ =	0.4cos10°
	1 - 0.4sin10°

or φ = 22.94°