what is pen stand???????????????????
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What are convex and concave mirrors? If the inner side of the spherical mirror is reflecting, it is called a concave mirror. If the outer side of the spherical mirror is reflecting, it is called a convex mirror. Concave mirrors can form inverted and real images and also virtual and erect images.
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A pen stand is an item of utility as it is used to store pens, pencils or other small stationary items
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