Answer:
Explanation:
frequency=c/λ
c=400m/s
putting values
2000=400/λ
λ=0.2m
Quoting from the article itself:
"Since it is above Earth's atmosphere, it gives us clearer pictures of space than telescopes on Earth can."
10m
The object distance and image distance is the same from the mirror. so the image is 5m behind the mirror.
5+5=10
The absolute magnitude of the star would be +5.
