Chapter : 4. Light Refraction
Image Formed of Concave Lens in Different Cases
Concave Lens in Different Cases
Case 1 : Object at infinity
A point object lying on the principal axis.
Rays come parallel to the principal axis and after refraction from the lens, appears to come from the second principal focus F2.
Fig. Concave lens point object at infinity, image at focus.
The image is formed at focus F2. It is virtual and point sized (figure.)
A big size object with its foot on the principal axis.
Parallel rays come inclined to the principal axis. Image of foot is formed at focus.
The image is formed at the second principal focus F2.
It is virtual–erect and diminished (figure.)
Fig. Concave Lens : big size object at infinity image at focus.
Case 2 : Object at a Finite Distance
Real object AB has its image A'B' formed between second principal focus F2 optical centre C.
The image is virtual–erect and diminished.
Case 1 : Object at infinity
A point object lying on the principal axis.
Rays come parallel to the principal axis and after refraction from the lens, appears to come from the second principal focus F2.
Fig. Concave lens point object at infinity, image at focus.
The image is formed at focus F2. It is virtual and point sized (figure.)
A big size object with its foot on the principal axis.
Parallel rays come inclined to the principal axis. Image of foot is formed at focus.
The image is formed at the second principal focus F2.
It is virtual–erect and diminished (figure.)
Fig. Concave Lens : big size object at infinity image at focus.
Case 2 : Object at a Finite Distance
Real object AB has its image A'B' formed between second principal focus F2 optical centre C.
The image is virtual–erect and diminished.
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