I am having toruble with my geometric progressions, in that i ahv ebeen given a question where i am given the 7th and 26th terms of a GP. I am required to find the ratio however, which i could do if i had the first term. Usually i can do this as they only give me gps that are one term apart, and...
IM not sure that this question should be here or in some other forum, anyway here is my question :
When light travels from a more dense material to a less dense one (say from water to air) the light speeds up again. However i...