Q. How long is the Marriage License valid?A. A Marriage License is valid for 60 days, beginning the day after it is issued. Members of the armed forces who can prove they are on active duty at the time of applying for the Marriage License can obtain a Marriage License valid for 180 days.
Lesson Summary. UV light is one type of electromagnetic wave. Other electromagnetic waves include radio waves, microwaves, visible light, and X-rays. UV light is used by humans to produce vitamin D, but overexposure to UV light can damage DNA and cause painful sunburns, cataracts, and skin cancer.
The advertised purpose of a Skylight or UV filter is to cut atmospheric haze by absorbing ultraviolet light. Since ultraviolet light can also reduce overall sharpness, absorbing UV rays will help sharpen your photos. A skylight filter will also reduce atmospheric blue by slightly warming a scene.