Physics · Optics
Which of the following statements are correct regarding a lens?
(a) The first principal focus is the position of the object whose image is at infinity.
(b) The first principal focus is the position of the object whose image is formed at twice the focal length.
(c) The second principal focus is the position of the real image whose object is at infinity.
(d) The second principal focus is the position of the object whose image is formed at twice the focal length.
(a) The first principal focus is the position of the object whose image is at infinity.
(b) The first principal focus is the position of the object whose image is formed at twice the focal length.
(c) The second principal focus is the position of the real image whose object is at infinity.
(d) The second principal focus is the position of the object whose image is formed at twice the focal length.
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Both (a) and (c)✓
- 2Both (b) and (d)
- 3Both (b) and (c)
- 4Both (a) and (b)
Correct answer
Both (a) and (c)
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