'गरीबी रेखा' का विचार सर्वप्रथम किसने दिया था ?
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Explanation:
A curved mirror is a mirror with a curved reflecting surface. The surface may be either convex or concave. Most curved mirrors have surfaces that are shaped like part of a sphere, but other shapes are sometimes used in optical devices.
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ye 1970 mai kiya gya tha ....
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