HC Verma - Concepts of Physics Part 1

Book: HC Verma - Concepts of Physics Part 1

Chapter: 18. Geometrical Optics

Subject: Physics - Class 7th

Q. No. 59 of Exercises

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The diameter of the sun is 1.4 x 109 m and its distance from the earth is 1.5 x 1011 m. Find the radius of the image of the sun formed by a lens of focal length 20 cm.

It is given that,

Diameter of the sun= 1.4 x 109 m

Distance between Earth and sun, u=1.5 x 1011 m

Focal length of the lens, f = 20cm

Using lens formula,

We know that magnification m is given by,


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