A source is at 4m height above the centre of a circular table of a circular table of radius 3m. The ratio of illuminance at and will be

a) |
b) |
c) |
1 |
d) |

A source is at 4m height above the centre of a circular table of a circular table of radius 3m. The ratio of illuminance at and will be

a) |
b) |
c) |
1 |
d) |

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