A green pigment(chlorophyll) is present in the leaf to increase  light absorption ad thus rate of photosynthesis increases.    4. The leaf has large networks of vascular bundles to richly supply  the leaf with water(xylem) and transport food to other parts of the  plant(phloem).he Chlorophyll is in the top palisade layer closer to the light so it can absorb lots of light energy for photosynthesis. The upper epidermis is also transparent which also helps the light to reach the chlorophyll. + 17 others found this useful.
According to the THX standard, a 50 TV is optimally viewed from 6 to 7 feet away. A 60. TV is optimal at almost 8 feet. 70 is recommended at almost 10 feet and 80 and up even further. You start getting any bigger with your TV screen size and you might not have the space for your couch to go back far enough.
This time you can divide your viewing distance by 3 to get the minimum screen size-and by 1.5 to get the maximum screen size. So, for example, if you know the viewing distance in your room will be about 10 feet (or 120 inches), you can work out that a good TV size will be in the range of: 120 inches Ã· 3 = 40 inches minimum screen size. 120 inches Ã· 1.5 = 80 inches maximum screen size. TV Viewing Distance to Screen Size. Now, that still gives us quite a bit of choice, but at least we can rule out screens below 40 inches and we've got a better idea of where to start looking.