1pcs Double Biconcave Lens | 75mm Diameter and 300mm Focal Length Instruments 5cm Focal Length: Featuring a

5cm Focal Length: Featuring a 7

These pans won't rust

Class A Tolerance: With a Class A tolerance of ±0

the model can focus an image on the retina

Needle Length 11cm

1pcs Double Biconcave Lens | 75mm Diameter and 300mm Focal Length Instruments 5cm Focal Length: Featuring aHigh Quality Glass: Made from durable and high quality glass, this Double Biconcave Lens is designed to last and provide accurate and reliable results in a variety of scientific applications. 75mm Diameter: With a diameter of 75mm, this lens is perfect for use in a range of optical experiments, including refraction, reflection, and more. 300mm Focal Length: Featuring a 300mm focal length, this lens is an ideal tool for creating focused images and