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MHT CET202016 Oct 2020Evening ShiftPhysicsRay OpticsActual

There are four convex lenses L ₁, ~L ₂, ~L ₃ and L ₄ of focal length 2,4,6 and 8 ~cm respectively. Two of these lenses form a telescope of length 10 ~cm and magnifying power 4 . The objective and eye lenses are respectively

Options

  1. AL1, L2
  2. BL1, L4
  3. CL2, L3
  4. DL4, L1

Correct answer

D. L4, L1

Step-by-step solution

(C) array l f ₀+ f _ e =10 f ₀ f _ e =4 f ₀=4 f _ e 5 f _ e =10 f _ e =2 f ₀=8 array So, L ₁ and L ₄ were used

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