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4. A convex lens is made of glass (n = 1.5) with one flat surface and...

4. A convex lens is made of glass (n = 1.5) with one flat surface and the other surface being convex having a radius of 40 cm. 

* What is the focal length of the lens? 

* How far in front of the lens must a 10 cm high object be placed such that the image produced is 
virtual and 30 cm high?

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