Question

Light rays that enter the hole of a pinhole camera form _____ on the back wall of the camera.

A. a right-side-up real image

B. an upside-down real image

C. a right-side-up virtual image

D. an upside-down virtual image

Answer 1

Upside down

Answer 2

Real Image.?

Answer 3

yea

Answer 4

B. an upside-down real image
If you were to put a photographic plate there, or possibly its modern day equivalent, then you could record the image and "keep the picture" so to speak. It's possible that the very first cameras (way, way, way before the digital stuff) did more or less this.

A real image is one that can be put on a screen WITHOUT the need for any other devices/lenses.
A VIRTUAL image is one that you'd need another device - a lens - to cast it onto a screen. When you're using a magnifying glass (assuming you do, or want to play Sherlock Holmes), the FIRST image the glass will produce is VIRTUAL. However, to get to your eye's retina, it goes through your eye's lens. That acts as the other device to focus the "VIRTUAL" image into a "real" image such that you can see it at all

Answer 5

Actually, it is neither a real nor a virtual image: it is no image at all but a projection.
An image is an intersection of rays from a point source, and no rays intersect on the screen of the pinhole camera.