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NEET2011PhysicsRay OpticsActual

A biconvex lens has a radius of curvature of magnitude 20 ~cm . Which one of the following options describe best the image formed of an object of height 2 ~cm placed 30 ~cm from the lens?

Options

  1. AVirtual, upright, height =0.5 ~cm
  2. BReal, inverted, height =4 ~cm
  3. CReal, inverted, height =1 ~cm
  4. DVirtual, upright, height =1 ~cm

Correct answer

B. Real, inverted, height =4 ~cm

Step-by-step solution

In general we have assumed =1.5 So, f=20 ~cm aligned 1 f & = 1 y + 1 u 1 20 & = 1 y + 1 30 1 y & = 1 20 - 1 30 = 10 600 y & =60 ~cm h_i h₀ & =2 h_i & =2 h_o h_i & =4 ~cm aligned Here, Image is real, inverted, magnified field and height of image is 4 ~cm .

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