What will be the number of images formed if three mirrors are placed mutually perpendicular to each other ?

i think 5 images will formed

When  two mirror are perpendicular to each other we have 3 images.

My doubt is that these three images will act as object for the third mirror as well as the object will result in 1 image so it comes to a total of 7.

But the images formed so may also act as object for the other two other mirrors.

I think it should be 9.

PLZ. Help

7Images formed between any 2 mirrors is: (360°/θ)−1Hence, 3 images between 2 mirrors, which are along the the sides. These 3 images form 3 images on the top, and the original body forms one on thop.∴ Total images=3+3+1=7