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In photo-extinction method, a source of light is directed through a suspension of ____________

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In photo-extinction method, a source of light is directed through a suspension of ____________

(a) Kerosene in cement

(b) Cement in kerosene

(c) Cement in water

(d) Water in cement

I have been asked this question in final exam.

Question is from Particle Size Measurement in portion Criteria of Purity and Characterisation of Materials of Engineering Chemistry I

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Correct answer is (b) Cement in kerosene

The best I can explain: In photo-extinction method, a source of light is directed through a suspension of cement in kerosene on to a photoelectric cell.

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