Question
Power of biconvex lens is P diopter. When it is cut into two symmetrical halves by a plane containing the principal axis. The ratio of power of two halves is
BITSAT
Physics
Ray Optics
2024
BITSAT 2024 (Memory Based Paper 3)
BITSAT Physics Question (2024) — Solution
Options
- A. 1: 2
- B. 2: 1
- C. 1: 4
- D. 1: 1
Answer
D. 1: 1
Step-by-step solution
Power of equiconvex lens =P i.e P= 1 f , where f is focal length of equiconvex lens. When an equiconvex lens is cut into two symmetrical halves by a plane containing the principal axis, then its focal length remains same. Hence, power of lens (each halves) aligned & P^ = 1 f P^ =P \\ & P^ P =1 \\ & P: P=1: 1 aligned
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