I have installed Porto theme. When I visited a product page and click on the image, it goes into full screen, which is exactly as per requirements. When I try to zoom in or out of the image using the magnifier glass icons,nothing happens.
I have no clue why this is the case.
See example on this webpage: http://188.8.131.52/lightcatcher-solar-100w-12v-mono-solar-panel.html