Convex Optical Lens 50mm

Quick answer: The LabEquip Convex Optical Lens 50mm is a converging lens – thicker at the centre than at the edges – used to focus parallel light to a principal focus and to study real and virtual image formation. It is a standard ray-optics and optical-bench component for school, college and university physics labs, used for focal-length measurement, magnification and image-formation experiments.

Product Description

This lens is thicker at its centre than at its edges. Parallel rays passing through it converge toward a principal focus on the far side, with the exact convergence point depending on the lens profile, refractive index and surrounding medium. Placing a real object beyond the focal point lets you form a real image on a screen; placing it closer than the focal point produces a virtual, magnified image instead.

The listed nominal size is 50 mm. We have not been able to confirm from the listing whether this refers to the lens diameter, clear aperture or mounting size, and we are not going to guess a more specific figure – please confirm the exact focal length, optical power, material and mounting with our sales team before a quantitative experiment. It is intended for secondary-school, college and university physics laboratories for focal-length measurement, ray tracing, magnification and optical-bench work.

Specifications

Suggested Procedure

• Inspect both lens faces for dust, scratches or chips before use.
• Mount the lens upright in a compatible holder, handling it only by the edges.
• Align it on an optical bench with a light source and screen along one axis.
• Adjust the object and screen distances to locate a sharp real image, or observe the virtual image formed when the object is closer than the focal length.
• Record distances to calculate focal length and magnification, then return the lens to protected storage.

Safety Note

Never look through the lens at the sun, a laser or an intense lamp. A convex lens concentrates light and can create an eye, skin or fire hazard if pointed at a strong light source.

Care & Maintenance

• Remove loose dust with clean air or a soft optical brush.
• Clean the faces using lens tissue and an approved optical cleaner only.
• Store the lens in a padded, dry and dust-free container.
• Protect the optical surfaces and edges from impact and abrasion.

Why Choose LabEquip

LabEquip (The Lab Equipment Pvt Ltd) supplies physics, chemistry, biology and STEM laboratory equipment to schools, colleges and training institutes. Pair this lens with our Optical Convex Reflector 50mm for a broader reflection-and-refraction comparison, or see our Laser Optics Experiment Tank Kit for a complete ray-optics setup. Visit our homepage to browse the full physics lab equipment range, and ask our sales team to confirm exact focal length and packaging before you order.

Frequently Asked Questions

What is a convex optical lens used for?

It is used to converge light and to study focal points, magnification and real or virtual image formation – a core demonstration in any school or college ray-optics course.

What does “50mm” mean for this lens?

The product name specifies a nominal 50 mm size, but the listing does not confirm whether this is the overall diameter, the clear aperture or a mounting dimension. Please confirm the exact measurement with our sales team.

What is the focal length of this lens?

The focal length is not stated in this listing, so we have not invented a figure. A real image can form on a screen when a real object is placed beyond the focal point of a suitable convex lens; confirm the exact focal length with our sales team before a quantitative experiment.

Is a lens holder included?

Whether a holder or mounting ring is included is not confirmed by this listing. Please check the approved bill of materials or ask our sales team before ordering.

Last Updated: September 2026