For light detector you can download the application lux light meter by Doggo apps from your phone play store

Biology Oct 26, 2020

For light detector you can download the application lux light meter by Doggo apps from your phone play store. After installing open the app and show your phone screen infront of the light source to read the light intensity. Do the experiments in distances of 20,40,60,80,100,120,140,160,180 and 200cm from the source and plot a graph of intensity along Y axis and distance along X axis.Interpret your results.Explain how inverse square law was utilized in photography.