^Image formation by a lens

^Image formation by a lens

(a) A concave lens always form virtual, erect & diminished image irrespective of the position of the object.

(b) With a convex lens following possibilities are there

Position of object
Ray diagram
Image produced
At ∞
At F
Real (inverted)
Extremely Diminished
m < < 1
Beyond C i.e.
Between ∞ and 2 F
Between F & C
Real (inverted)
Diminished
m < 1

 

At C
At C
Real (inverted)
Same as size of object
m = 1
Between F and C
Beyond C
Real (inverted)
Magnified
Object at F
At ∞
Real (inverted)
Infinite size
m → ∞
Between F and P
Beyond 2 F Virtual (erect)
Magnified
m > 1
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