Question

Do LDR’s respond to all wavelengths of light?

(a) Yes

(b) No

The question was asked by my school teacher while I was bunking the class.

This interesting question is from LDR Sensor topic in division Interfacing of Sensors, Actuators, and Other Modules of Arduino

Answer 1

The correct choice is (b) No

The best I can explain: LDR’s are non linear devices. Their sensitivity varies with the wavelength of light that’s incident on them. Some LDR’s might not response to a certain range of wavelengths at all depending upon the kind of material used in different devices, which consequently have different spectral response curves.