If a person places 2 of these lenses a few inches away from each other in a tube, will it work like a monoscope?

A monoscope was a kind of tv pattern generator used to tune a tv system 30 years ago, so they don't. If you mean a telescope, you could place two of this lenses in a tube about 28 inch apart, with a magnification of about 2.5, so it just work as a demo, not a practical telescope.

are they labeled, like which one is concave and which one is convex?

They are not labeled, but the convex lenses are thicker in the center, with thinner edges. The concave lenses have thinner centers and thicker edges.

Could I use these to magnify the image from a cheap movie projector?

Has not been tested for that application, feel free to give it a shot though; if optical lenses do that, then these are optical lenses.

Would these work to make a simple refracting telescope??

In theory yes, but please be careful in reviewing focal length ratios to ensure that the tube length is reasonable.

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Eisco 6pc Optical Lens Set, 2" - 200mm, 300mm, 500mm Focal Lengths - 3 Double Convex & 3 Double Concave, 2" (50mm) Diameter Lenses - Optically True Glass - Ground, Beveled Edges - Labs

Product ID: 619528527

📏Focal Lengths: 200mm, 300mm, 500mm

🔍2" Diameter

🔬Optically True Glass

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Description

🔭 See the World Clearly with Eisco's Optical Lens Set!

DURABLE DESIGN - Ground, beveled edges ensure safety and longevity.
PREMIUM QUALITY GLASS - Crafted from optically worked glass for crystal-clear results.
PERFECT FOR CLASSROOMS - Engage students with hands-on learning in optics.
VERSATILE FOCAL LENGTHS - Explore light refraction with 200mm, 300mm, and 500mm options.
ELEVATE YOUR EXPERIMENTS - Transform your physics demonstrations with precision optics.

The Eisco 6pc Optical Lens Set features three double convex and three double concave lenses, each with a 2" (50mm) diameter. With focal lengths of 200mm, 300mm, and 500mm, these optically true glass lenses are perfect for physics classrooms, providing high-quality demonstrations of optics and light refraction.

Specifications

ASIN	B00BIKGMZ8
Are Batteries Required	No
Batteries required?	No
Best Sellers Rank	#121,812 in Office Products ( See Top 100 in Office Products ) #68 in School Curriculum Resources
Brand	Eisco
Brand Name	Eisco
Color	Transparent
Colour	Transparent
Customer Reviews	4.4 out of 5 stars 253 Reviews
Global Trade Identification Number	00849230033934
Item Weight	0.3 Pounds
Item weight	0.3 Pounds
Lens Material	Glass
Lens material	Glass
Manufacturer	Eisco
Manufacturer Part Number	FSC1018
Model Number	FSC1018
UPC	849230033934 789164198838 885629689177
Unit Count	6 Count

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KD 12.35

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TrustScore 4.5 | 7,300+ reviews

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