If the angles of the mirrors that you used on periscope are not parallel to each other you would see the image upside down.
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In a periscope, light reflects off a series of mirrors at specific angles. This reflection process causes the image to appear upside down when viewed through the periscope.
When the image reaches the eye, it is right-side up. The optics in your eye flip the image upside down in the process of absorbing the light. The up-side down image is then sent to your brain. You brain translates it back to right side up, and then creates the image for you to see. The image never appears upside down to you, because your brain does not create the image for you to see until it has flipped it back right-side up.
If you could see the image projected onto the retina of the eye by the lens, it would be of the environment that the person in question is looking at, but upside down.
The brain automatically corrects the inversion of the image on the retina, so the world appears right side up to us. This is due to the way our brains process visual information and interpret it as being upright.
The antonym for "periscope" is "submerge." A periscope is a device used to see above water, while submerge means to go underwater or be completely covered by something.
Things may appear upside down in a microscope due to the nature of the lenses used. Microscopes use convex lenses that invert the image as light passes through them. This optical property is essential for magnifying the specimen for examination.