Of course. This is a fascinating thought experiment that flips some of the most fundamental aspects of our universe on their head. Here is a description of the laser pulse's journey, breaking it down by its properties.

### The Setup

*   **The Universe's Rule:** The speed of light ($c'$) is proportional to the local gravitational field strength ($g$). We can write this as $c' \propto g$.
*   **The Journey:** A laser pulse (a packet of photons) travels from a region of very weak gravity ($g \approx 0$) towards a massive black hole, where gravity is immense.

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### The Journey of the Laser Pulse

#### 1. Change in Speed

This is the most direct consequence of the hypothetical rule.

*   **At the Start (Far from the Black Hole):** The spaceship is in a region of very weak gravity. Here, $g$ is close to zero. According to the rule $c' \propto g$, the speed of the laser pulse at the moment it is sent is **extremely slow, almost zero**.
*   **During the Approach:** As the pulse travels towards the black hole, it enters regions of progressively stronger gravity. The value of $g$ continuously increases. As a result, the speed of the laser pulse, $c'$, **continuously accelerates**.
*   **Near the Black Hole:** As the pulse gets very close to the event horizon, the gravitational field strength $g$ becomes extraordinarily high. Consequently, the speed of the pulse $c'$ would become **incredibly fast**, far exceeding the constant speed of light ($299,792,458 \ m/s$) we know in our universe. In theory, as it approaches the singularity where $g$ approaches infinity, its speed would also approach infinity.

**In summary: The laser pulse starts its journey moving very slowly and accelerates dramatically as it falls into the black hole's gravity well.**

#### 2. Change in Frequency (and Energy)

This aspect would likely behave similarly to our universe, based on the conservation of energy.

*   **Gravitational Blueshift:** As any object "falls" into a gravitational well, it gains energy. For a photon, its energy is defined by the equation $E = hf$, where $h$ is Planck's constant and $f$ is its frequency.
*   **Energy Gain:** As the pulse gets closer to the black hole, its energy ($E$) increases due to the work done on it by the gravitational field.
*   **Frequency Increase:** Since the energy of the photon is directly proportional to its frequency, an increase in energy means its **frequency must also increase**.

An observer positioned near the black hole would measure the incoming laser pulse as having a much higher frequency (and shorter wavelength) than it had when it was emitted. The light would be shifted towards the blue end of the spectrum, a phenomenon known as **gravitational blueshift**.

**In summary: The frequency of the laser pulse steadily increases as it approaches the black hole, making the light appear "bluer" and more energetic.**

#### 3. Change in Trajectory

This is where the most counter-intuitive effect occurs, completely opposite to the gravitational lensing we observe in our universe.

*   **Refraction Analogy:** In optics, light bends when it moves from one medium to another where its speed changes. This is called refraction. We can think of this hypothetical spacetime as a "medium" with a variable refractive index.
*   **Gravitational Refractive Index:** The refractive index ($n$) of a medium is inversely related to the speed of light in it ($n \propto 1/v$). In this hypothetical universe, the speed of light $c'$ is *lowest* far from the black hole and *highest* near it.
    *   Far from the black hole (weak gravity): $c'$ is slow, so the "refractive index" of space is **high**.
    *   Near the black hole (strong gravity): $c'$ is fast, so the "refractive index" of space is **low**.
*   **Repulsive Lensing:** The laser pulse is traveling from a region of high refractive index (slow speed) to a region of low refractive index (fast speed). In optics, when light does this (like going from water into air), it bends *away* from the normal (the line perpendicular to the boundary). In this case, the normal is the radial line pointing directly at the black hole's center.

Therefore, as the laser pulse approaches the black hole at an angle, it will **bend *away* from the black hole**. This creates a phenomenon of **repulsive or diverging gravitational lensing**. Instead of the massive object focusing light, it would actively scatter and deflect it.

**In summary: The trajectory of the laser pulse would be bent away from the black hole, causing a diverging or "negative" lensing effect, the exact opposite of what happens in our universe.**

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### Conclusion of the Journey

The journey of the laser pulse in this hypothetical universe is bizarre and fascinating:

| Property    | Change during approach to Black Hole                                    | Reason                                                                                                  |
| :---------- | :---------------------------------------------------------------------- | :------------------------------------------------------------------------------------------------------ |
| **Speed**       | Starts near zero and **continuously accelerates** to immense speeds.      | The fundamental rule: speed of light is proportional to the gravitational field strength ($c' \propto g$). |
| **Frequency**   | **Continuously increases** (the light is gravitationally blueshifted). | Conservation of energy: the photon gains energy as it falls into the gravity well ($E=hf$).            |
| **Trajectory**  | **Bends *away* from the black hole** (repulsive/diverging lensing). | Refraction: the pulse moves from a "slow" region (high refractive index) to a "fast" one (low index). |

An observer watching this event would see a pulse of light that speeds up and turns bluer as it nears the black hole, only to be deflected away from it as if by a repulsive force. A black hole, in this universe, would be an object that is impossible to see directly (as it still absorbs what hits it) but would also make the universe behind it appear warped and pushed away.