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65
M: +2.00/-0.00

The permittivity of water at optical frequencies is 1.75εo .It is found that an isotropic light source at a distance d under-water forms an illuminated circular area of radius 5m, as shown in the figure. The critical angle is θc.

The value of d (in meter) is _____

[GATE EC 2017 Set 2]
A
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