Layer disappears on OpenLayers after specific zoom in

Question

I have added some layer(s) and a base layer using OpenLayers v 2.11, layer does not appear when it first opened the page, but after zoom out it does appear. Why is behaving in this way, are there any parameteres for always visible?

var map = new OpenLayers.Map("map");
var wms = new OpenLayers.Layer.Google("Google Streets", {
                numZoomLevels: 12
            });
map.addLayer(wms);
var wms2 = new OpenLayers.Layer.WMS("Basic1", "http://localhost:8080/geoserver/wms",
           {
               layers: 'SomeLayers',
               transparent: true,
               numZoomLevels: 12
           }, {
               isBaseLayer: false
           });
map.addLayer(wms2);
var ls = new OpenLayers.Control.LayerSwitcher();
map.addControl(ls);
map.addControl(new OpenLayers.Control.ZoomBox());
ls.maximizeControl();

map.setCenter(lonlat, 6);

Answer 1

A openlayers wms layer has 4 parameters name (string), url (string), getMap params (everything inside first {}), options params (everything inside second{})

numZoomLevels is openlayers options parameter not wms getmap parameter. so it should be with the isBaseLayer option.