I am having an HDMI port in my laptop .Can i use a HDMI cable to connect it to a normal Television.Or it can be connected only to HDMI tv?

basically, the answer is no.
HDMI is a pure digital signal, and a "normal television" is a analog device. As InDiSent asked, if your TV has a HDMI connector, then yes you will be able to connect to that TV, if not, then you are out of luck.
Unfortunately there are no converters from HDMI to S-Video or composite. They do not exist, and a few devices that claim to do it, are over a hundred dollars.