Giving 40 points!

i need to design an experiment to support the hypothesis that light travels in straight lines except at the point it enters a new medium.

a) what can i use for this experiment?
b) how do i use it to complete this experiment? how can i conduct an experiment using it?

Get a flashlight a glass. have someone hold the flashlight and point it on the glass while you hold it. now take a cup of water and put the light on the bottom of the glass while you hold it up then pour the water out . it should work

Answerthe distance between the two ends of the galaxy is 150,000 light years;

Perhaps seek some professional ? it isn't very asking some children who are just trying to find out answers to homework.also, it seems professional would actually be good to you. obviously it isn't going to magically fix your depression, but it'll do something. drugs, smoking weed, it won't do much, especially if your husband is against it. if you do it he'll dislike it. but talk to him, try and get him to listen to you, and figure everything out together, okay? there's a website- maybe it can offer some ?