Question

Which of these telescopes has the largest mirror, that is, the most "light gathering" capability?

		Large Synoptic Survey Telescope, or "LSST", now under construction. in Chile.
		James Webb Space Telescope, to be launched by NASA and ESA in 2020, and placed into orbit at a Lagrange point far from Earth.
		Palomar telescope, in California north of San Diego.
		Hubble Space Telescope, now in low Earth orbit.

Answer 1

LSST has the largest mirror of 8.4 m. It is under construction in chile. It is a wide filed survey reflecting telescope with 8.4 meter primary mirror. It will give the broad view of the object  at a particular time . The images are recorded on CCD camera.