How Gravitational microlensing use to detect Rouge planet

We know that planets outside our solar system are called as exoplanets all these planets are revolve around its own star but this Rouge Palnets are strange they doesn't revolve stars they move around the galaxy or move around anywhere in space

How astronomers find Rouge planet

These Planets are invisible because they doesn't revolve around any stars and it doesn't reflect any light so with normal telescope we can't find it , this planets are very cold so it is difficult to find even using infrared telescope it is like finding a black ball in a dark room

Then how astronomers find this planets here they using gravitational microlensing

When an rogue planet moves in front of a more distant star from our view from point light the star bends as it passes through the warped space-time around the planet. The planet acts as a magnifying glass, amplifying the brightness of the background star.

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