◆◆◆◆1 principle points ◆◆◆◆◆
The point where lateral magnification is unit .
It means height of object and height of image equal.
Height of image(h2)=Height of object(h1)
◆{The plane which passes through principle point called principle plane}.◆
◆◆◆◆◆◆2Nodal points ◆◆◆◆◆◆
The points where angular magnification is unit known as Nodal points .
That Means
Angle of object【alpha1】 = Angle of image【alpha2】
◆{The plane which passes through Nodal points known as Nodal plane }◆.
◆◆◆◆◆3 Focal point ◆◆◆◆◆◆
The point from which a light ray which is parallel to axis passes after refraction through lens is known as Focal point.
◆{The plane which passes through Focal points known as Focal plane} ◆
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