6. (foll by: to) related (to) or dependent (on). 7. (when: postpositive, often foll by to) having a subsidiary or minor relationship (with). 8. (General Physics) (esp of a beam of light or particles) arriving at or striking a surface: incident electrons.
Answers (1) hill. Personally, if you use salt water properly, it won't cause any damages to your sunglasses. But if you rinse your sunglasses in salt water for a long time, it may cause some damages to the lens coating of your sunglasses. Anyway, you needn't rinse your sunglasses in salt water.
Hard water stains appear as white, hazy spots on glass surfaces. This is due to a build-up of alkaline and other minerals in your water. While these stains are notoriously tough to remove, there are several cleaning and prevention methods that can help get your glass back into sparkling condition.