COMEDK · Physics · 25. Ray Optics
A beam of light parallel to the principal axis of a concave and convex lens, first passes through the concave lens of focal length 0.5 m and then through the convex lens of focal length 1.75 m . If the lenses are placed 1.25 apart, which of the given statement is true?
- A The emergent beam will focus at 1.75 m on the principal axis.
- B The emergent beam will pass parallel to the principal axis.
- C The emergent beam will focus at 1.25 m on the principal axis.
- D The emergent beam will focus at 0.75 m on the principal axis.
Answer & Solution
Correct Answer
(B) The emergent beam will pass parallel to the principal axis.
Step-by-step Solution
Detailed explanation
Let the focal length of the concave lens be \(f_1 = -0.5\) m and the focal length of the convex lens be \(f_2 = 1.75\) m. The distance between the lenses is \(d = 1.25\) m. A beam of light parallel to the principal axis incident on the concave lens will appear to diverge from…
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