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JIPMER 2004
Exam
JIPMER
Year
2004
Subject
Physics
Chapter
Ray Optics

JIPMER 2004 · Physics · Ray Optics

Two thin lenses of powers 12 D and -2 D respectively are placed in...

Two thin lenses of powers 12 D and -2 D respectively are placed in contact, the power, focal length and nature respectively will be

Options

  1. A8D,0.8 m8 \mathrm{D}, 0.8 \mathrm{~m}, convex
  2. B14D,0.5 m14 \mathrm{D}, 0.5 \mathrm{~m} convex
  3. C5D,0.2 m5 \mathrm{D}, 0.2 \mathrm{~m}, convex
  4. D10D,0.1 m10 \mathrm{D}, 0.1 \mathrm{~m}, convex

Correct answer

D. 10D,0.1 m10 \mathrm{D}, 0.1 \mathrm{~m}, convex

Step-by-step solution

Given: P1=12D,P2=−2DP_1=12 \mathrm{D}, P_2=-2 \mathrm{D} Power of combination P=P1+P2=12−2=10DP=P_1+P_2=12-2=10 \mathrm{D} Focal length f=1P=110 m=0.1 mf=\frac{1}{P}=\frac{1}{10} \mathrm{~m}=0.1 \mathrm{~m} The combined lens will be convex (convergent)
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