I have an apartment with an older mirrored vanity in the bathroom. On the top is where there are the bulbs but in front of those bulbs use to be a long rectangular plastic lens to dampen the light so it wasnt like lookin into the sun every time you looked into the mirror. That "light shade plastic fixture"thingy got broken in half,i was wondering what it is called and/or if i can get a link to buy a new one

Typically parts aren’t sold for lights, so you may find that your best bet is to find a piece of translucent plastic which can be cut and drilled to replace the old. Keep in mind that plastics come in all kinds of flavors though – and some are more heat resistant than others. If you’re not sure that the replacement plastic can take the heat, go to a shop selling glass and ask them to cut and drill a piece of frosted glass so you don’ have to wear sunglasses in the bathroom. Hope this helps.