It is of two types, convex lens and concave lens. Convex lens: This lens bulges out at the centre and is thinner at the edges, i.e. the two sides. Concave lens: This lens is thinner at the centre ...

The refractive lens, operated with a variable concave profile ... mm and a maximum numerical aperture of 0.17. According to Equation (11), this lens is expected to yield a spectral resolution ...

In a ray diagram, a concave lens is drawn as a vertical line with inward facing arrows to indicate the shape of the lens.

The lens has an aperture of 80 micrometers - roughly the size of the cross-section of human hair - and a focal length of 60 micrometers. Lenses are the key part of imaging systems such as ...