An object is placed in a medium of refractive index 3. An electromagnetic wave of intensity 6 × 108 W/m2 falls normally on the object and it is absorbed completely. The radiation pressure on the object would be (speed of light in free space = 3 × 108 m/s):
1
36 Nm–2
2
18 Nm–2
3
6 Nm—2
4
2 Nm–2