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An object is placed in a medium of refractive index 3. An electromagnetic wave of intensity 6 × 10 8 W/m 2 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 × 10 8 m/s):

1. 6 Nm –2
2. 18 Nm –2
3. 2 Nm –2
4. 36 Nm –2

Correct answer: 6 Nm –2

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