How many times is the illumination of the Sun of Pluto less than the illumination of the Earth, if it is known that it decreases

How many times is the illumination of the Sun of Pluto less than the illumination of the Earth, if it is known that it decreases in inverse proportion to the square of the distance?

Distance to Pluto 40 AU. That is, therefore, the illumination of Pluto will be 40 ^ 2 = 1600 times less.

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