how to make a projector with a glass cup

 

A projector is a device to project an image onto a surface such as a wall or screen. The light beam can originate from various sources, including electronic light sensors or lamps, liquid crystal displays, cathode ray tubes (CRTs), plasma screens and light emitting diodes.

 

Naxa1920 x 1080 Resolution Home Theater LCD Projector Combo with 9000 Lumens Model# NVP-3001C
 

 Image source: https://www.homedepot.com/

A LCD will not produce an actual projection on the front of the glass cup but it will become translucent so that you can use your hand to illuminate the inside of the cup."

 

Epson EpiqVision™ Mini EF11 Laser Projector

Image source: https://www.dell.com/

Many people have tried this idea before without success. It's just not possible to make an object that reflects ultraviolet light back after you put it in front of the projector lens. Unfortunately I am not a physicist and can't explain why that is. The only thing I know for sure is that you can't do it, but you can see what happens when you try anyway.

 

XGIMI MoGo Full HD Smart Projector (DLP, 210 ANSI Lumens, HDMI + USB + Android TV 9.0 + Bluetooth + Wi-Fi, Portable Projector with Google Assistant, White/Aluminium)

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You should always use protective equipment on any projector lens when not looking through them (don't look at the lens in some cases). With the lens of a regular projector pointing towards you, your eyes will be only about a foot away from the lenses. 

 

PT-LW335U 3LCD Portable Projector

Image source: https://na.panasonic.com/

Unfortunately this causes much more visible danger than it does because it gets really hot really quickly. It could burn your eye into an eyeball. 

 

LG PF610P Full HD LED Portable Smart Home Theater CineBeam Projector

Image source: https://www.lg.com/

This may also damage theprojection lens so don't try to do this with lenses built into projectors like most people do.

 

SUS ProArt Projector A1 LED projector is the world’s 1st Calman Verified professional projector, factory pre-calibrated for Delta E < 2 exceptional color accuracy. With its 98% sRGB and REC.709 wide color gamut coverage and 3,000-lumen LED light source, it delivers top notch and vivid FHD visuals with up to 30,000-hour lifespan.

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What you want to do is take a cup that you can use your hand to hold without burning yourself. It should be clear, because the ultraviolet light will not be able to pass through glass that is not transparent.

 

The Epson 1795F is super slim measuring just 11.5 x 8.4 x 1.7 inches. It comes with a carrying case but it can easily fit into a normal laptop bag along with your laptop. At 1.8 kg, it is not difficult to move it around. It is very comfortable to take it here and there and set up quickly wherever you want.

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To make it work, put some glue on the inside and outside of the glass cup. You don't need much or it will overflow. 

 

The BenQ W1700 4K Projector for Gaming

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Then put the cup on a flat surface with the bottom of it just below or above your face and fully in front of the projector lens so that there are no obstructions between them. Try to hold things steady for long periods of time as you project (get a friend).

 

SPONSORED Chief Rpa Elite Projector Hardware Mount Black (RPMB267)

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The glue you put on the inside will reflect ultraviolet light towards the projector lens, and it will come back at least partially. 

 

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It will be dimmer than it went in, but it will still have the same basic shape. If you don't have a UV flashlight to test this with then there are a few alternatives:

 

ASUS ZenBeam E2 mini LED projector, automatic portrait projection mode, 300 LED lumens, WVGA (854 x 480), wireless mirroring, built-in battery for up to 4-hour portable video playback, power bank, USB Type-A, HDMI®, 5-watt speaker

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1) Shine a blacklight on the glass cup for about 30 seconds. Then try to project an image onto the inside of the glass cup by holding a white piece of paper about 2 inches from your face for about 30 seconds as you look into the cup.

 

KodakFLIK X7 1280 x 720 LCD Home Theater Projector System with 100 Lumens -Tripod and Case Included -Projects Up to 150 in.

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 You should see an image on both sides of your paper because it is being reflected from both sides at once.

 

Epson EF-100 Mini-Laser Streaming Projector with Android TV

 Image source: https://www.dell.com/

2) Turn off the lights where you are going to do this experiment. Hold the glass cup in front of a white piece of paper that is about 2 inches from your face, so that if you look through the glass at the paper it is about an inch away from your eyes. 

 

Anker Nebula Mars II HD Projector (DLP, 300 Lumens, Android 7.1, HDMI + USB + Bluetooth + Wi-Fi + Screen Mirroring, Dual Speakers, Black)

Image source: https://www.croma.com/

Look into the bottom of the cup for about 1 minute and it should look like there is a ghost in there.

 

ET-ELT23 3LCD Projector Zoom Lens

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I want to warn you all again before you try this experiment. If you don't handle all of these steps with extreme care, it could be very dangerous and damaging to repairable property.

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