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Question about light intensity and resistance

  1. Mar 22, 2007 #1
    1. The problem statement, all variables and given/known data
    For my physics coursework, I have to design a laboratory experiment using an LDR to investigate how intensity of light emitted from a lamp varies with wavelength. In the procedure I will use diffraction gratings to separate light into wavelengths. The problem I am having is "How a measure of light intensity can be obtained from the LDR" please can anybody show me how to obtain intensity from an LDR.

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Mar 22, 2007 #2


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    Science Advisor
    Homework Helper

    You need the technical data sheet for the particular LDR part number you will be using. The data sheet will tell you how the LDR resistance changes with light intensity, and how the sensitivty of the LDR varies with the wavelength of the light.
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