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A biconvex lens of focal length f forms a circular image of radius r of sun in focal plane. Then, which option is correct?

Options

  1. Ar^2 f
  2. Br^2 f^2
  3. CIf lower half part is covered by black sheet, then area of the image is equal to r^2 / 2
  4. DIf f is doubled, intensity will increase

Correct answer

B. r^2 f^2

Step-by-step solution

r=f or array lc or & r f & r^2 f^2 array

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