Lenses.

You must have seen lenses is used in day to day life. Some examples are : the lenses used by old persons for reading , lense embedded in the front door of the houses , the lens which the watch marker attaches to his eye etc.

Lenses are used in spectacles . They are also used in the telescope as you have learnt in the previous standard.

Try this at home.

Material: convex lens , screen meter scale , stand for the lens etc .

Keeping the screen fixed, obtain a clear image of distant object like a tree or a building with the help of the lens on the screen . Measure the distance between the screen and lens with the help of the meter scale . Now turn the other side os the lens toward the screen .

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Good company in a journey makes the way seem shorter. — Izaak Walton