Wasim I think you're confusing HTTP redirect with loadbalancing here - the f5 and the virtual servers and pools act by load balancing ie taking the HTTP traffic on a single IP address and port and sending it to the backed servers, whatever their address and port is.
If you want to do redirects, that is something different - this CAN be done via iRules or of course on a server but it's not loadbalancing.
To have a website spread across a number of servers, create a virtual server on the f5 with an IP address (IP address X) and allocate a pool containing web servers (IP address Y). Map the URL to IP address X, the client will connect to this and the loadbalancer will send the traffic on to the relevant backend server.