What Happens if you Block Half a Lens? | Physics with Professor Matt Anderson | M27-14

So I've got a lens and I'm forming an image of some object. But now I block half the lens. What do you think happens to the image? Top half disappears? Bottom half? Something else? Let's see.

Physics with Professor Matt Anderson

[TheStefProff]

Thank you, Professor! I like ur videos and the way you explain everything. It's constructive and it helps me and other to fully comprehend how the laws of nature works. And, of course, your videos are exposed to the whole world, not just US or the UK. Some videos are good short, other are good long.

[fizixx]

I love these kinds of things in science!

[kasperchristensen]

Thanks a lot for publishing these excellent videos, Professor Anderson. Cheers from Denmark!

[sergiv]

This may be a dumb question, but how come if I block half of the lens of my glasses, i only see half the image? Is it because my eyes are directly behind it? Also, what happens if instead of blocking the bottom half, you block the center 50% of the lens (inner circle)?

[Shaitan-Dan]

Would the effect really be the same if you use an opaque object to block 50% of the lens vs using a lens with 50% transparency?

[nxnlnpd]

i wonder how much intense ratio will be? 1/4 ? 1/16 ? someone help me please. :)