Under direct sunlight typical illumination at noon is on the order of 1 kW/m^2 (this is a slight overestimate, since Japan is in the mid-latitudes and not the tropics). Typical surfaces reflect roughly 10-20% of the light that strikes them; let's say 10% to make the math easy and to compensate for the previous overestimate. So 100 W of mostly visible light is reflected, i.e., 100 joules of energy per second.
A single photon of visible light has an energy of about 4 x 10^-19 J, so that's 2.5 x 10^20 photons reflected from our hypothetical square meter per second.
The black hole has a radius of around 30 km, or an apparent area in the sky equivalent to a plane of size pi * (30 km)^2 = 2800 km^2. It's actually a bit bigger than that because the "shadow" of a black hole is larger than the event horizon, and that's what we need to hit, not the horizon itself. So let's say 10,000 km^2 to make it nice and round. That's 10,000 km^2 of coverage on a "sphere" of radius 1500 ly and hence of area 4 * pi * (1500 ly)^2 = 2.5 x 10^33 km^2. So the shadow of the black hole occupies about 4 x 10^-30 of the sky.
If we spread out 2.5 x 10^20 photons across the sky evenly, we hit the black hole's shadow with about one-billionth of a photon from our square meter of Earth per second, or about one photon every 30 years. You hit it with a photon from somewhere on Earth at most roughly every ten seconds or so (when the geometry is such that Earth is close to "full" from the black hole's perspective).
The situation for actually lensing it properly to get it back to Earth is far worse, since not only do you have to hit the "shadow", you have to hit a particular point in the distorted image of the sky that corresponds to Earth, meaning you effectively have to thread this needle twice. Assuming you just want to hit Earth, which is bigger than the black hole's shadow, you're still trying to hit another 10^-26 or so shot. A single photon from Earth should make that shot roughly every 10^19 years, or about a billion times the current age of the Universe.
TLDR: ain't gonna work.
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In reality, none of this matters for a more fundamental reason: diffraction. The fact that light "smears out" as it travels poses a fundamental limit to resolution based on the size of your telescope, and the resolution we're trying to achieve here is orders of magnitude beyond it. For scale, Hubble is pretty close to the diffraction limit for visible light and a telescope of its size, and it already can't image planets within our own solar system at the resolution we're talking about here. So no reasonable telescope could even image Earth from the black hole, much less image a tiny portion of Earth.
...or that would be true, if you limited yourself to physical telescopes.
See, the diffraction limit depends on the size of your telescope, or more properly, on the size of its lens. And the effective size of a gravitational lens can be very, very large indeed. It turns out that current technology is sufficient to reach a distance where the distortion of the Sun's own gravity focuses light - the required distance is a few times the distance to the Voyager probes. From that vantage point, you could theoretically use the Sun itself as a giant telescope. And the resolutions achievable are tight enough that, while you wouldn't be able to image individual square meters, you actually could image details of planets with a resolution of tens of km (the rough equivalent of looking at a globe from a distance of a couple of feet away) across galactic distances. [1]
The reason this works is that it's not hitting the gravitational shadow of the gravitationally-lensing object itself - it's hitting a focal "ring" with a very large radius around the object, effectively magnifying the imaged object by ~eleven orders of magnitude. At such magnification even a handful of square meters start hitting with meaningful numbers of photons, though diffraction is still (I think) the limiting factor on actually resolving anything.
The black hole here is not much more massive than the Sun, so it wouldn't achieve too much more power. But with careful observation, you could use the hole to image Earth to a scale that would let you map out our world and our civilization to reasonable accuracy - if not the details of our corporate endeavors.
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[1] https://en.wikipedia.org/wiki/Solar_gravitational_lens
See also https://en.wikipedia.org/wiki/WHL0137-LS for an example of this kind of lensing on the scale of galaxies, which allows us to see a single star (or possibly a binary) from literally halfway across the Universe.
