Engineering Physics I - Refraction Through Lenses
Refraction Through Lenses
Lens:
A lens is an object usually made of glass bounded by one or two spherical
surfaces.
Types of lens
a. Convex lens
or converging lens
A lens is said to be converging
lens if the width of beam decreases after refracting through it.
It is thick at the middle and thin
at the edge.
b.
Concave lens or diverging lens
A lens is said to be diverging lens
if the width of beam increases after refracting through it.
It is thin at the middle and thick
at the edge.
Some terminologies:
a. Center of
curvature (C) :
Center of curvature of a surface of
a lens is defined as the center of that sphere that forms the lens. A lens
consists of two radius of curvatures (C1 and C2).
a. Optical
center (c) :
The geometrical center of lens is
called optical center of lens.
b.
Principal axis
The line joining the two center of
curvatures and passing through the optical center is known as the principal
axis.
a. Focal
length(f)
It is the length between the
principal focus(F) to the optical center(c) of a lens.
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