The diameter of the moon is about 3500 km. What will be the size of the image made of the Moon by a concave mirror whose radius is 3m when the nearest distance from Earth to the Moon is 35 x 10 to the power 4 km.
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Explanation:
Here, angle subtended by moon
=
3⋅5×10
5
3500
radians
Also, focal length of the mirror,
f=R/2=1⋅5m
=1⋅5×10
3
mm
Required diameter of image
∴D=fθ=1⋅5×10
3
×
3⋅5×10
5
3500
=15mm
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