Class/Course - Medical Entrance

Subject - Physics

Chapter - Ray Optics and Optical Instruments

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Q.1 A boy is trying to start a fire by focusing Sunlight on a piece of paper using an equiconvex lens of focal length 10 cm. The diameter of the Sun is 1.39 x 109 m and its mean distance from the earth earth is 1.5 x 1011 m . What is the diameter of the Suns image on the paper?
  9.2 x 10-4 m
  6.5 x 10-4 m
  6.5 x 10-4 m
  12.4 x 10-4 m