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

🎯200mm, 300mm, 500mm focal lengths variety

💎Optically true, ground & beveled glass

🔍2" (50mm) diameter precision lenses

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Description

🔬 Elevate your optics game with precision and style!

COMPLETE 6 PIECE SET - Includes 3 double convex and 3 double concave lenses, ready for immediate use and experimentation.
PREMIUM GLASS QUALITY - Optically worked, polished glass with ground, beveled edges ensures durability and safety.
IDEAL FOR STEM LEARNING - Perfect for physics classrooms and professional demonstrations to elevate optics understanding.
VERSATILE FOCAL LENGTHS - Three converging and three diverging lenses spanning 200mm to 500mm for diverse experiments.
PRECISION OPTICS FOR CLARITY - Spherical lenses crafted with 2" diameter for sharp, accurate light refraction.

The EISCO 6pc Optical Lens Set features six 2" 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 experiments, making it an essential toolkit for physics classrooms and scientific demonstrations.

Specifications

ASIN	B00BIKGMZ8
Are Batteries Required	No
Batteries Required?	No
Best Sellers Rank	#64,121 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #13 in Science Classroom Optics Kits
Brand	EISCO
Brand Name	EISCO
Color	Transparent
Customer Reviews	4.4 out of 5 stars 254 Reviews
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	6.0 Count

Reviews

M**E

17.03.2026

L**N

29.05.2025

S**E

29.01.2019

R**E

11.10.2025

G**.

21.05.2024

C**?

17.02.2024

S**M

19.06.2017

C**T

11.03.2022

D**O

30.01.2025

D**A

27.04.2019

M**S

19.12.2024

A**R

29.09.2019

G**A

18.12.2019

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