What is an IR cut Filter?

[rodrexmatthew]

How is it related with clear picture?

 

[ss202sl]

http/en.wikipedia.org/wiki/Infrared_cut-off_filter

 

[Alex0777]

IR cutter is nothing but a color filter which blocks the infrared light. This helps to get a proper and clear image. This is used to block the unwanted light which includes longer wavelength. During good sunlight or day time an IR cut filter is used. They help to get a focused image.