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When parallel rays strike the surface of a convex mirror , they are reflected outward and diverge away from the mirrored surface . It was easily raised in a very few minutes , and below was the grave in which pauper bodies were piled until within a foot or two of the surface ; when the soil was shovelled over , and stamped down , and the wooden cover went to do temporary duty over another hole . Mining is , of course , confined to the lunar surface . Service histories and failure analyses of dynamic components show that fatigue failures almost always nucleate on or near the surface of a component . It could serve as a turnaround station for lunar landing vehicles which could ferry up liquid oxygen and other materials from the lunar surface .