Light on a torus

Geometry Level 4

Q.4.A uniform point-source of light is located at the centre of a torus. If ratio of inner to outer radii is 2 3 \frac 2 3 then the fraction of total radiation intercepted by the torus is equal to?

1 5 \frac 1 5 1 4 \frac 1 4 1 7 \frac 1 7 1 6 \frac 1 6

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