Convex Lenses Explained: Uses, Image Formation, and Custom Optical Solutions

What Is a Convex Lens?

A convex lens is a transparent optical element that is thicker in the center and thinner at the edges. It converges parallel light rays to a single point known as the focal point, which is why it is also called a converging lens.

📷 [Insert Image: Convex lens with ray diagram showing convergence]

How Does a Convex Lens Work?

When light passes through a convex lens, it bends toward the principal axis and meets at the focal point. The bending of light depends on the curvature of the lens and the refractive index of its material.

📌 Convex Lens Definition

A convex lens is a lens that converges parallel rays of light to a real focal point due to its outward-curving surfaces.

Convex Lens Image Formation: Explained with Diagrams

The image formed by a convex lens varies depending on the object’s distance from the lens. Here’s a quick reference:

📷 [Insert Image: Ray diagrams for all 5 scenarios]

Why Do Convex Lenses Invert Images?

Convex lenses invert images when the object is placed beyond the focal point because the light rays cross each other after passing through the lens. This causes the image to appear upside down and reversed.

Convex Lenses Uses: Real-World Applications

Convex lenses are essential in both everyday life and advanced optical systems. Below are some major applications:

Double Convex Lens Formula

A double convex lens has two outward-curving surfaces. The basic lens formula is: 1f=1v−1u\frac{1}{f} = \frac{1}{v} – \frac{1}{u}f1​=v1​−u1​

Where:

• f = focal length
• v = image distance
• u = object distance

The magnification of a convex lens is given by: M=h2h1=vuM = \frac{h_2}{h_1} = \frac{v}{u}M=h1​h2​​=uv​

Where h₁ is the object height and h₂ is the image height.

Convex Lens Price: What to Expect

The cost of convex lenses depends on their material, size, surface accuracy, and coatings.

📷 [Insert Table with Prices by Material: N-BK7, Sapphire, ZnSe, CaF₂]

Custom Convex Lens Manufacturing at Bote Singapore

At Bote, we manufacture high-precision convex lenses tailored to your application—whether for imaging, lasers, or vision systems.

✅ Our Capabilities:

• Lens Types: Plano-convex, Bi-convex, Aspheric
• Materials: N-BK7, Fused Silica, Sapphire, ZnSe, CaF₂
• Diameter Range: 2 mm – 150 mm
• Surface Accuracy: up to λ/10
• Coatings: AR, BBAR, DLC, custom
• Inspection Tools: Zygo Interferometer, Spectrophotometer

📷 [Insert Image: Precision lens polishing at Bote]
📷 [Insert Image: Interferometric surface testing]

📦 Low MOQ, quick turnaround, and global delivery supported from Singapore.

Convex Plano Lens vs Double Convex Lens

Q&A: Convex Lenses

❓ Is a convex lens converging or diverging?

✅ Converging. It focuses light rays to a point.

❓ What kind of image does a convex lens form?

That depends on the object distance. It can form real and inverted images, or virtual and magnified ones.

❓ Where are convex lenses used most commonly?

In eyeglasses, cameras, projectors, magnifiers, microscopes, and telescopes.

❓ What is the focal length of a convex lens?

It’s the distance from the center of the lens to the focal point, typically measured in mm or cm. This depends on the curvature and the lens material.

Why Choose Bote for Custom Convex Lenses?

🌍 Based in Singapore with no export restrictions
🔬 Full in-house testing and metrology
🧪 Prototyping and OEM support
📈 High-precision custom fabrication
💼 Trusted by defense, aerospace, R&D, and medical sectors

🔗 Explore Our Optical Components Services

Conclusion

Convex lenses are essential tools in optics, transforming how we see, magnify, and project images. Whether you need lenses for vision correction, scientific instruments, or laser systems, Bote Singapore delivers custom, high-quality optical lenses with global reach and precision engineering.

📩 Ready to source your custom convex lens? Visit www.bote.com.sg or contact us for a quote today.

• Inspection Equipment List and Metrology of Bote Optics
• Introduction of BOTE Key Equipment
• Catalog of Precision Optics
• Catalog of Imaging Optics
• ISO9001-2015 Certified