Lights! Crossword

Lens with a longer focal length than standard
Lens comprising two convex spherical surfaces
Positive focal length elements that have one spherical surface and one flat surface
Lens have a steeper convex surface and is thicker at the centre than at the periphery.
lens has a steeper concave surface and is thinner at the centre than at the periphery
used to expand light beams or to increase focal lengths in optical systems
have a negative focal length and are best used to diverge a converging beam
Rays of light that pass through the lens are brought closer together (they converge)
causes light that enters the lens to spread out, or diverge
they are all physically longer than their focal length
first lens system that allowed elimination of most of the optical distortion or aberration at the outer edge of lenses.
compound lens used mostly in camera lenses that reduces optical aberrations over a large focal plane.
lens that is symmetrical about its aperture stop with four elements in two groups.
It consisted of two doublet lenses with an aperture stop in between
curved on both sides
lens that causes a beam of parallel rays to diverge
system that forms an image free from chromatic aberration
symmetrical across both its horizontal and vertical axis.
used in beam expansion, image reduction, or light projection applications.
transmissive optical device that focuses or disperses a light beam by means of refraction