Ared filter only allows red light to pass through it. it is to red light and to all other types of light. a. opaque; opaque b. transparent; opaque c. opaque; transparent d. transparent; transparent

As the filter allows red light to pass through it, the filter is transparent to red light. Since red light is the only type of light that can pass through the filter, the filter is opaque to all other types of light.

B. transparent; opaque

You get 6 for mechanical