A diffraction grating has 300 lines per mm. if light of wavelength 630 nm is sent through this grating, what is the highest order maximum that will appear?

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Loss in amenity , biodiversity , which are most difficult to assess

Which of the following is an example of an opposing signal? no examplthates given.   i would say, that traffic lights in a city at major intersections direct the flow of traffic in opposite directions so would be an example.also, stop signs on either side of the same street would be an example. at a train crossing, the light for allowing car traffic in opposite directions or not would be another example.