You create the image of an object, a creature, or some other visible phenomenon that is no larger than a 15-foot Cube. The image appears at a spot within range and lasts for the duration. The image is purely visual; it isn’t accompanied by sound, smell, or other sensory effects.
As a Magic action, you can cause the image to move to any spot within range. As the image changes location, you can alter its appearance so that its movements appear natural for the image. For example, if you create an image of a creature and move it, you can alter the image so that it appears to be walking.
Physical interaction with the image reveals it to be an illusion, since things can pass through it. A creature that takes a Study action to examine the image can determine that it is an illusion with a successful Intelligence (Investigation) check against your spell save DC. If a creature discerns the illusion for what it is, the creature can see through the image.
* - (a bit of fleece)
One of the more convincing illusions is someone trying to sneak around.
If you need to escape a pursuer (and you first get out of their sight) you can hide yourself by making a false wall, large tree, boulder, crate, or whatever else makes sense for you to hide inside. (If they rely on sight)
Or you could prank your friends my making it look like you're inside a gelatinous cube.
You can also hide behind a tree and make it look like you’re the person sneaking around the opposite direction.
Can this be used to make an image of a huge mirror to reflect a gaze attack? for instance a medusa?
My thought is yes, since any object created would look real unless the study action is taken...therefore it would still be reflecting any available light.
...but it's an illusion, so doesn't interact with light?
...but would one SEE a silent image if they were blinded, or if it were complete darkness? so it WOULD interact with light?
The spell description doesn't indicate it's only a mental image so not sure here...
I'm leaning toward it CAN be reflective but curious on what others think.
Yes, absolutely. Nowhere does it say that the illusion doesn't interact with light.