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" (50mm) Diameter - 3 Double Convex Lens & 3 Double Concave Lens - 200mm, 300mm, 500mm Focal Lengths - Optically True Glass - Ground, Beveled Edges

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

Product ID: 2239158

Details

Brand
EISCO
Color
Transparent
Item Weight
4.8 ounces
Lens Material
Glass
Unit Count
6 Count

🎯200mm, 300mm, 500mm focal lengths

💎Optically true, ground & beveled glass

🔍2" (50mm) spherical lenses

A$37

Duties & taxes included

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Description

🔬 Elevate your optics game—because clarity is the new cool!

BALANCED LENS SET - Includes 3 double convex and 3 double concave lenses for comprehensive optics exploration.
DURABLE POLISHED GLASS - Crafted from optically worked glass with ground, beveled edges for longevity and safety.
VERSATILE FOCAL LENGTHS - Switch seamlessly between 200mm, 300mm, and 500mm for diverse optical experiments.
PRECISION OPTICS FOR SHARP FOCUS - Experience crystal-clear light refraction with high-quality spherical lenses.
CLASSROOM READY SCIENCE ESSENTIAL - Elevate your physics demos and hands-on learning with a trusted, top-ranked lens kit.

The EISCO 6pc Optical Lens Set features six 2" (50mm) diameter spherical lenses—3 double convex and 3 double concave—with focal lengths of 200mm, 300mm, and 500mm. Made from optically true, ground, and beveled glass, this durable set is designed for precise light refraction and is ideal for physics classrooms and scientific demonstrations.

Specifications

ASIN	B00BIKGMZ8
Best Sellers Rank	#86,619 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #24 in Science Classroom Optics Kits
Brand Name	EISCO
Color	Transparent
Customer Reviews	4.4 4.4 out of 5 stars (254)
Global Trade Identification Number	00849230033934
Item Weight	4.8 ounces
Lens Material	Glass
Manufacturer	Eisco
Manufacturer Part Number	FSC1018
Model Number	FSC1018
UPC	849230033934 789164198838 885629689177
Unit Count	6 Count

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