my main question is that when my brother plays ps2 games in ps3 the graphics are not good and when i play those games in ps3 the graphics are great. Is this normal is there any trouble with my brother's 60 gb ps3?
lemnur, the problem sounds like it is in the settings of your brothers ps3. Under settings on your ps3 cross bar there is a ps2 setting (sorry, not near my ps3 at the moment so am going by memory).. if you look in these settings I think there is something like game upscaler or something similar but you should find the solution there.
Scroll across to SETTINGS section & scroll down to GAMES SETTINGS & then set ps/ps2 upscaler & then set ps/ps2 smoothing http://manuals.playstation.net/document/en/ps3/current/settings/gamesettings.html#2434
