Listed following are the names and mirror diameters for six of the world’s greatest reflecting telescopes used to gather visible light. rank the telescopes from left to right based on their light-collecting area from largest to smallest. for telescopes with more than one mirror, rank based on the combined light-collecting area of the mirrors.

It seem like there are information missing on the question posted. Let me answer this question with all I know. So here is what I believe the answer is,
 Giant Magellan Telescope 
Hawaii's Giant Space Eye 
Third Mirror Cast for Giant Magellan Telescope

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“other instruments such as gravimeters and magnetometers are also used in the search for petroleum. extracting crude oil normally starts with drilling wells into an underground reservoir. when an oil well has been tapped, a geologist (known on the rig as the "mudlogger") will note its presence. “ this is what i found on google i hope it