The Andromeda galaxy lies about 2.5 million light-years away. To what distances do the angular resolutions of SST (3"), HST (0.05"), and a radio interferometer (0.001") correspond at that distance?

explanation:

v=uf/(u-f)

= 5.-10/(5+10) convex lens has negative focal length

v=ir = 3x15 =45 v

a.) travels faster in solids because the particles are closer together.

air is a gas water is a liquid

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