Question

Which is the independent variable
A) angle of light
B)temperature of material
C) type of material

Answer 1

The independent variable is the thing you deliberately change or control in an experiment. Any of A, B or C could be an independent variable depending on the experiment.

Examples:
- If you measure reflected or transmitted light as you tilt a surface, angle of light (A) is the independent variable.
- If you measure conductivity or expansion as you heat/cool a sample, temperature (B) is the independent variable.
- If you compare how different substances behave under the same conditions, type of material (C) is the independent variable.

If you tell me the experiment you have in mind I can say which of these is the independent variable there.