Question
Download Solution PDFGiven below are four statements-
(p) The second principal focus of a lens is the position of the object, real or virtual whose image is at infinity.
(q) The second principal focus of a lens is the position of the image, real or virtual whose object is at infinity.
(r) The first principal focus of a lens is the position of the object, real or virtual whose image is at infinity.
(s) The first principal focus of a lens is the position of the image, real or virtual whose object is at infinity.
Examine the above statements and find which among then are correct.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFCONCEPT:
- Nature, position, and relative size of the image formed by a convex lens for various positions of the object:-
Position of the object |
Position of the image |
The relative size of the image |
Nature of the image |
At infinity |
At focus F2 |
Highly diminished, point-sized |
Real and inverted |
Beyond 2F1 |
Between F2 and 2F2 |
Diminished |
Real and inverted |
At 2F1 |
At 2F2 |
Same size |
Real and inverted |
Between F1 and 2F1 |
Beyond 2F2 |
Enlarged |
Real and inverted |
At focus F1 |
At infinity |
Infinitely large or highly enlarged |
Real and inverted |
Between focus F1 and optical center O |
On the same side of the lens as the object |
Enlarged |
Virtual and erect |
EXPLANATION:
- From the above discussion, we can say that, statements q and r are correct. So option 1 is correct.
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