Q1 of 25 Page 10

Define the principal focus of a concave mirror? ( CBSE 2004)

All the light rays which are travelling parallel to the principal axis are bound to meet at a point on the principal axis after reflection from the mirror. This point on the principal axis is called the principal focus of the mirror.

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The magnification produced by a plane minor is +L What does this mean ? ( CBSE 2005)

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Find the power of a concave lens of focal length 2 m. ( CBSE 2011)

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What does the negative sign in the value of magnification produced by a mirror indicates about an image? ( CBSE 2009)

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Define 1 Dioptre of power of a lens. ( CBSE 2010)