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Reflection from a spherical mirror - Coggle Diagram
Reflection from a spherical mirror
Concave mirror
Reflection of light from a concave mirror
Real image
1/u+1/v=1/f
Virtual image
1/u-1/v=1/f
Magnification
m=v/u
u is always positive
Convex mirror
Reflection of light from a convex mirror
Virtual image
1/u-1/v=1/f
Magnification
m=v/u
v and f are always negative
Terminology
Pole(P): the centre of the mirror.
Centre of curvature(C): centre of the sphere from which the mirror is made.
Axis: straight line joining P to C.
Focal(F): the point halfway between P and C
Focal length(f): distance from F to P
Real image
is formed by the actual intersection of rays
It can be formed on a screen
It is formed in a concave mirror if the object is outside the focus
In a concave mirror is always inverted and in front of the mirror
Virtual Image
Is formed by the apparent intersection of rays
It cannot be formed on a screen
It is formed in a concave mirror if the object is inside or on the focus
In a concave mirror is always upright, magnified and behind the mirror
Image in a convex mirror
is always virtual, upright, diminished and behind the mirror
To measure the focal length of a concave mirror
