▪ Supposing that the cone is perflectly reflecting i.e. does not absorb or transmit

▪ Supposing that cone is perfectly absorbing i.e. does not reflect or transmit

Find the radiation force on cone in both cases.

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## Comments

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TopNewestFor the 2nd case, I have used projection area. It is semicircle and a semi ellipse,

So we can write area=\(\frac {\pi R^{2}}{2}+\frac {\pi RH}{2}\)

And then use \(IA/c\)

Is this approach right?

And I have no idea for the first case

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for the first case the force will become twice of what u have found in the second case .change in momentum will be 2h/lambda .

And if it was a case where here was reflection and absorbtion .then u calculate the force in each case and multiply it with the coefficient of absorbption and reflection respectively (which would be specified in the question )(also to note that a+r=1 where a and r are the coefficients of absorbtion and reflection respectively )

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Exactly twice, are you sure? And I havent really found a proof for other half to be ellipse, can you find?

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