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.
So if you want an HDTV with a screen that's the same height as your old 34-inch TV, for example, the chart below shows that you need to buy an HDTV with a 42-inch screen, and that they will both have a height of 20.4 inches. On either TV, a non-HD picture will be the same size.s we can see in the example above, the old 32-inch TV has 491.52 square inches of screen area, and the 32-inch HDTV has 439.6 square inches in other words, less. When comparing an old TV and HDTV of the same diagonal screen size, the HDTV screen is actually 11 percent smaller.