retina display 

Statements about this table:
macbook pro have a type of ppi model with ppcm of 87
the resolution of the model with ppd of 69 be 2048x1536
model
ppi (pixels per inch )
ppcm (pixels per cm )
resolution
iphone 4 / 4s and ipod touch (4th generation)
326
128
960640
iphone 5 / 5s / 5c and ipod touch (5th generation)
326
128
1136640
ipad ( 3rd / 4th generation / ipad air )
264
105
20481536
ipad mini (2nd generation)
326
128
20481536
macbook pro with retina display 15
220
87
28801800
model
typical viewing distance (in / cm)
pixels per degree (ppd)
iphone 4 / 4s and ipod touch (4th generation)
inches (cm)
57
iphone 5 / 5s / 5c and ipod touch (5th generation)
inches (cm)
57
ipad ( 3rd / 4th generation / ipad air )
inches (cm)
69
ipad mini (2nd generation)
inches (cm)
85
macbook pro with retina display 15
inches (cm)
77