OS Details

Apple iPad 10.2 (2020) has been launched in September 2020.
Apple iPad 10.2 (2020) have iPadOS 14

Screen Dimensions

Apple iPad 10.2 (2020) screen size is 10.2 inch. Physical dimensions for Apple iPad 10.2 (2020) device is 9.87 x 6.85 x 0.30 INCH or ( 250.6 x 174.1 x 7.5 MM).

Displaying of Units are in this order "Height x Width x Thickness"

Screen Pixel Density and CSS Pixel Ratio

"Pixel" is smallest unit/element of any display.

The total number of pixels that fit into an inch is referred to as "Screen Density" or "Pixel Density" and it measured as "Pixels Per Inch".
Pixel Desnsity have limits to display Pixels Per Inch depends on different screen sizes. When number of pixels per inch increases than it's screen-size limit, the Display resolution will increase but actual device width/height in pixels remain same. Actual device pixels are known as Device Independent Pixels or CSS Pixel Ratio.

Apple iPad 10.2 (2020) resolution is 1620 x 2160 ^PX with ~ 264 pixel desnsity.
Apple iPad 10.2 (2020) viewport size is 810 x 1080 ^PX with ~ 132 actual pixel density, which means it have 2.0 xhdpi display pixel density.

Screen Resolution and Viewport

The sum of pixels which are displaying on a device is called as "Screen Resolution". and sum of actual pixels of any device is reffered to as "Viewport".

Apple iPad 10.2 (2020) have 10.2" physical screen size and its resolution is about 1620 x 2160 Pixels with approximately 264 PPI pixel density. Apple iPad 10.2 (2020) has viewport size 810 x 1080 Pixels and its pixel ratio is about 2.0.

For better understanding screen actual sizes, viewport sizes, display resolution and about their density click here.

CSS Media Queries

Apple iPad 10.2 (2020) Only Media Query which covers portrait to landscape width.

@media only screen and (min-width: 810px) and (max-width: 1080px)  { /* Your Styles... */ }

Apple iPad 10.2 (2020) Media Queries (In terms of Tablets only)

@media only screen and (min-width: 768px) and (max-width: 1024px)  { /* Your Styles... */ }

Apple iPad 10.2 (2020) Min-Width Media Queries

@media only screen and (min-width: 810px) { /* Your Styles... */ }

Apple iPad 10.2 (2020) Min-Height Media Queries

@media only screen and (min-height: 1080px) { /* Your Styles... */ }

Apple iPad 10.2 (2020) Landscape Media Queries

@media only screen and (min-width: 1080px) and (orientation: landscape) { /* Your Styles... */ }

Apple iPad 10.2 (2020) Portrait Media Queries

@media only screen and (min-width: 810px) and (orientation: portrait) { /* Your Styles... */ }

Apple iPad 10.2 (2020) Retina Media Queries

@media
  only screen and (-webkit-min-device-pixel-ratio: 2.0),
  only screen and (   min--moz-device-pixel-ratio: 2.0),
  only screen and (     -o-min-device-pixel-ratio: 2.0/1),
  only screen and (        min-device-pixel-ratio: 2.0),
  only screen and (                min-resolution: 264dpi),
  only screen and (                min-resolution: 2.0dppx) { 
    /* Retina styles here */
}
                                

Retina is actually based upon device pixel ratio. Devices mostly have 2x or 3x display so you can use general retina media queries to display high resolution content on all kind of devices. Retina 2x and Retina 3x media queries given below:

Retina 2x Media Query

@media
  only screen and (-webkit-min-device-pixel-ratio: 2),
  only screen and (   min--moz-device-pixel-ratio: 2),
  only screen and (     -o-min-device-pixel-ratio: 2/1),
  only screen and (        min-device-pixel-ratio: 2),
  only screen and (                min-resolution: 192dpi),
  only screen and (                min-resolution: 2dppx) { 
    /* Retina styles here */
}
                                

Retina 3x Media Query

@media
  only screen and (-webkit-min-device-pixel-ratio: 3),
  only screen and (   min--moz-device-pixel-ratio: 3),
  only screen and (     -o-min-device-pixel-ratio: 3/1),
  only screen and (        min-device-pixel-ratio: 3),
  only screen and (                min-resolution: 384dpi),
  only screen and (                min-resolution: 3dppx) { 
    /* Retina styles here */
}
                                

Apple iPad 10.2 (2020) Specifications

• Launch Date September 2020
• iPadOS 14
• Physical Screen Size 10.2 INCH
• Resolution 1620 x 2160 PX
• Viewport Size 810 x 1080 PX
• Pixel Density 264 PPI
• Device-Independent Pixels 132 PPI
• Pixel Ratio 2.0 xhdpi
• Width 1620 PX
• Height 2160 PX
• Device Width 810 PX
• Device Height 1080 PX
• Dimensions 250.6 x 174.1 x 7.5 mm (9.87 x 6.85 x 0.30 in)
• Weight 495 g - 1.08 oz