How Can I Measure the Width of Light Waves Using a Prism?

JWW
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I've been trying to measure the width of light waves for one of my reports but I can't seem to find where the different waves separate. now granted I'm at younger age, I just need a easier way to find out where to waves meet when you shine light through a prism onto a wall.
 
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Hello everyone, I'm Cosmo. I'm an 18 years old student majoring in physics. I found this forum cause I was searching on Google if it's common for physics student to feel like they're in the wrong major in the first semester cause it feels like too much for me to learn the materials even the ones that are considered as "basic math" or "basic physics", I've initial fascination with the universe's mysteries and it disconnect with the reality of intense, foundational mathematics courses required...
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