lyadalachanc Posted February 12, 2019 Share Posted February 12, 2019 I am doing an experiment which involves starting a fire with a magnifying glass. I need help in coming up with what variable I should vary. So far I have come up with absorptivity of the material, light source, the color of the light source, and also the environmental factors (humidity, altitude, oxygen levels etc.). What are some other possible variables for the burning glass experiment? Link to comment Share on other sites More sharing options...
Sensei Posted February 12, 2019 Share Posted February 12, 2019 Distance at which photons passing through glass will focus is one of the most important variables.. https://en.wikipedia.org/wiki/Focal_length Link to comment Share on other sites More sharing options...
lyadalachanc Posted February 12, 2019 Author Share Posted February 12, 2019 Ok... but I need less obvious variables. For example, maybe something to do with the absorption spectra of the material? Link to comment Share on other sites More sharing options...
Carrock Posted February 12, 2019 Share Posted February 12, 2019 You could consider various types of white paper which can't be directly burnt with your glass, only charred. You could brown but not overly oxidise a sufficient area that you can then take advantage of increased absorption to ignite the paper. Some skill required, at least for an eight year old, IIRC. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now