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A convex lens is of focal length 30 cm. ...

A convex lens is of focal length 30 cm. Find the distance where the object shoud be placed in front of the lens so that the image is formed 10 cm form the lens? What is the magnification.

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MODERN PUBLICATION-REFLECTION AND REFRACTION-EXAMPLE
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  7. When an object is placed at a distance of 60 cm from a convex spherica...

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  12. What is the speed of light?

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  19. Velocity of light in a medium is 1.5xx10^8 ms^-1. Find the refractive ...

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  20. The refractive index of diamond is:

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