Final answer:
A blue filter absorbs all visible light other than blue light.
Step-by-step explanation:
The correct answer is b) Absorbs.
A blue filter absorbs all visible light other than blue light. It selectively allows blue light to pass through while absorbing red and green light. The absorbed light energy is converted into heat or some other form of energy.
An example of a blue filter is the blue lens of sunglasses. It absorbs most of the visible light, reducing glare and protecting the eyes from harmful ultraviolet (UV) radiation.