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MHT CET20227 Aug 2022Morning ShiftPhysicsRay OpticsActual

A double convex lens made of glass has both radii of curvature of magnitude 20 ~cm . Incident light rays parallel to the axis of the lens will converge to a point at a distance ' L ' from the common pole P. The value of L is [Refractive index of glass =1.5 ]

Options

  1. A10 ~cm
  2. B40 ~cm
  3. C20 3 ~cm
  4. D20 ~cm

Correct answer

D. 20 ~cm

Step-by-step solution

Lens maker formula: 1 f =( -1) ( 1 R ₁ - 1 R ₂ ) If incidence ray has direction left to right & |R₁ |= |R₂ |=20 ~cm = R , =1.5 , then aligned & I f =( -1) ( 1 R - 1 (-R) )= 2( -1) R & = 2(1.5-1) 20 ~cm & f=20 ~cm aligned

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