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Which of the formulae give us the relation between resistance and illumination in the LDR Sensor?

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Which of the formulae give us the relation between resistance and illumination in the LDR Sensor?

(a) Resistance = Constant_1 * (Illumination^Constant_2)

(b) Resistance = Constant_1 * (Illumination+Constant_2)

(c) Resistance = Constant_1 ^ (Illumination-Constant_2)

(d) Resistance = Constant_1 + (Illumination^Constant_2)

The question was posed to me during an internship interview.

Enquiry is from LDR Sensor in chapter Interfacing of Sensors, Actuators, and Other Modules of Arduino

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Correct option is (a) Resistance = Constant_1 * (Illumination^Constant_2)

Explanation: Constant_1 * (Illumination^Constant_2) gives the correct relation between the resistance and the illumination in the LDR sensor. Here the SI unit of resistance is Ohms and that of Illumination is Lux.

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