In the days before HDTV, a close-up view of the picture on a TV screen might look something like the picture below at left: you could tell that the picture was made up of a series of vertical lines. An even closer view, like

the picture below at right, reveals that each line is made up of many rows of red, blue, and green pixels–the three “primary colors” of light. By lighting up these pixels with different intensities, the screen could create the appearance of different colors, if viewed from a reasonable distance away. For example, suppose that in a certain area of the screen, the red and blue pixels are brightly lit, while the green ones are left dark. If a viewer is far enough away from the screen, their eyes will not be able to resolve the separate pixels, and they will see the red and blue mixed together to form purple. 

a) Use Rayleigh’s criterion to estimate the smallest angular size that a human eye can resolve with visible light. (Hint: the “aperture” here is the pupil of the eye.)

TV resolutions in terms of the number of lines going across (resolution width) Because all TV's have exactly the same amount of lines going down

same amount of discernable dots going across. For example, an American s horizontally (resolution height), but the number of lines going across

quality of the TV and the signal broadcast to it.

cross while a TV station may offer about 330 dots across!

A standard TV used to have 485 lines of pixels across the screen:

b) Use this number of lines, together with your result from part (a), to estimate how far away a viewer must

possible to see any lines because they have all blurred into each other.

be from such a TV screen in order to see a smooth picture (i.e., not to resolve the individual pixels).

e maximum resolution of the TV has been reached. These test lines are re above. Because the lines are stacked from left to right, the number of

called the horizontal resolution! 

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