With the help of a labelled ray diagram, describe how a converging mirror can be used to give an enlarged upright image of an object.
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For obtaining an enlarged upright image of an object, the object is placed between focus (F).
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Write the formula for a lens connecting image distance (υ), object distance (u) and the focal length (f). How does the lens formula differ from the mirror formula?
When an object is placed at a distance of 36cm from a convex lens, an image of the same size as the object is formed. What will be the nature of image formed when the object is placed at a distance of:
The absolute refractive indices of glass and water are $4 / 3$ and $3 / 2$ respectively. If the speed of light in glass is $2 \times 10^8$ $m / s$, calculate the speed of light in (i) vacuum, (ii) water.