व्हाट इज द एज ऑफ माइक्रो मोटर स्किल डेवलपमेंट
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A lens bound by two spherical surfaces bulging outwards is called a bi-convex lens or simply a convex lens. A single piece of glass that curves outward and converges the light incident on it is also called a convex lens. They are both thicker in middle than near the edges. ... It is thinner in the middle than the edges.
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