The Hobby-Eberly Telescope has a diameter of 9.2 meters. The United Kingdom Infr

Question

The Hobby-Eberly Telescope has a diameter of 9.2 meters. The United Kingdom Infrared Telescope has a mirror of 3.8 meters. How many times larger is the light-gathering power of the Hobby-Eberly Telescope compared to the United Kingdom Infrared Telescope? The Hobby-Eberly Telescope has a diameter of 9.2 meters. The United Kingdom Infrared Telescope has a mirror of 3.8 meters. How many times larger is the light-gathering power of the Hobby-Eberly Telescope compared to the United Kingdom Infrared Telescope?

Explanation / Answer

Work out the area of the lens using pi*r^2

For diameter of 9.8 m

pi*4.9^2 = 75.43

For diameter of 3.8 m

pi*1.9^2 = 11.34

So,

= 75.43/11.34

= 6.65 times

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