Parts of a transverse wave include: Crest - the point on the wave
Trough - the point on the wave
Wavelength - the from one crest to the n3ext crest, or one trough to the next trough
Amplitude - the of the wave from the midpoint to the highest point (crest) or the lowest point (trough)

In positive numbers less than 1, the zeros between the decimal point and non zero are significant

Alinearly polarized electromagnetic wave has an average intensity of 196 w/m^2. this wave is directed towards two ideal polarizers (in real polarizers, transmission is also effected by reflection and absorption). polarizer a is oriented with its transmission axis at an angle of θ_1=20.8∘ with the incident electric field. polarizer b has its axis at an angle of θ_2=63.0∘ with the incident electric field. what is the average intensity of the wave after it passes through polarizer a? what is the average intensity of the wave after it passes through polarizer b? suppose that the two polarizers a and b are interchanged. what would the average intensity be after passing through both polarizers?

What is the role of lenses in microscopy?