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Worksheet 980

PPI can be calculated from knowing the diagonal size of the screen in inches and the resolution in pixels (width and height). This can be done in two steps

Using the Pythagorean theorem, for 3 different screen resolutions:

Diagonal Resolution - Pixels

Using the Diagonal Resolution from the previous formula we calculate the PPI for 3 corresponding screen sizes :

Pixels Per Inch (PPI)

Results:

10.1 inch tablet screen of resolution 1024×600 : 117.5PPI
21.5 inch PC monitor of 1080p resolution : 102.46PPI
27 inch PC monitor of 1440p resolution : 108.78PPI

Pixels Per Inch (PPI)

Pixels per inch (PPI) (or pixels per centimeter (PPCM)) is a measurement of the pixel density ... more

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Angular resolution

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Angular resolution (by a telescope array)

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Spatial resolution

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Width of the screen (in relation to aspect ratio)

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Height of the screen (in relation to aspect ratio)

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Area of the screen (in relation to aspect ratio)

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Angular resolution (by a microscope)

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Ricco's Law

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Quality Factor

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Damping ratio (related to Quality factor)

Formula first contributed by:
trooper

In engineering, the damping ratio is a dimensionless measure describing how ... more

Magnification of the lens

Converging lens in air will focus a collimated beam travelling along the lens axis to a spot (known as the focal point) at a distance “f” from ... more

Photometric ( luminous) exposure

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Aris Law of Video Gaming Value for Money

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Foivos Law of Video Gaming - f(Gt)

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Auger electron spectroscopy - Energetics of Auger transitions (more rigorous model)

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Anelastic Attenuation Factor

In reflection seismology, the anelastic attenuation factor, often expressed as seismic quality factor or Q (which is inversely proportional to attenuation ... more

Babinet's principle - in Radiofrequency Structures

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Depth of focus (depth of field)

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