TS EAMCET · Physics · Ray Optics
A converging mirror is placed on the right hand side of a converging lens as shown in the figure. The focal length of the mirror and the lens are and respectively. The separation between the lens and the mirror is and their principal axes coincide. A point source is placed on the principal axis at a distance to the left of the lens. If the final beam comes out parallel to the principal axis, then the value of is:
- A
- B
- C
- D
Answer & Solution
Correct Answer
(C)
Step-by-step Solution
Detailed explanation
Image will act as object for mirror, v1+u2=40 1f2=1u2+1v2 here v2=∞ ⇒f2=u2=15 cm Lens formula, 1f1=1u1-1v1 ∴ 120=1d-125 ⇒d≈12 cm
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