(MATH) For "Retina" tag next macbook pro must pack with 202 ppi display

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according apple equation.

= 2 tan-1 (h/2d)
can revert
h = 2d * tan ( / 2 ) <----(a)

if want retina display give = 0.00029

d distance eye display around 1.3x of display size
case so
d of 11 = 13.3 , 13 = 17.3 , 15 = 19.5 , 17=22.1 , 21 = 27.3 , 27 = 35.5

case d not 1.3x assume new d
11 = 15 , 13 = 17 , 15 = 18 , 17=20 , 21 = 24 , 27 = 26

(a) ill h = 2(d)tan(0.00029/2)
11 = 0.00435 , 13 = 0.00493 , 15 = 0.00522 , 17=0.0058 , 21 = 0.00696 , 27 = 0.00754

ppi = 1/h
11 = 230, 13 = 202, 15 = 192, 17 = 173, 21 = 144, 27 = 133
 

so guess

11" , 13" must use 2048x1536 display res pack 232 , 196.92 ppi.

15" , 17" can use same 2560x1440 display res because pack 196 ppi , 173 ppi pass retina quality.

22" imac must use 2560x1440 display res pack 140 ppi

, last big thing 27" use 3840x2160 163ppi
 


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