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#### Define the following:- (a)   Center of curvature   (b)   Radius of curvature     (c)   Pole    (d)   principal axis (e)   Principal focus     (f)    Focal length



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#### Differentiate between primary and secondary cells.



A primary cell cannot be recharged whereas a secondary cell can be recharged.
In a primary cell chemical reaction is irreversible whereas in a seconda...

Asked by Omm prakash

Jun 14, 2014

#### Difference between density and relative density? Or State the difference between density and relative density. Or Distinguish between density and relative density. Or Distinguish between relative density and density. Or Distinguish between specific gravity and density.



1. The ratio between density of a substance and density of water is called relative density.
2. Relative density =

#### What is the difference between Shadow and Image?



Shadows are black, whereas images are colourful. Shadows of objects placed in the sun change in length with the position of the sun through the day. Your shadow will be at its longest at ...

#### Describe the construction and working of a dry cell ?



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#### What is the difference between convergent and divergent beams of light



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Asked by Yash Raj

Feb 18, 2015



Ano...

Sep 29, 2013

#### IF X + 1/X=3 THEN X4 + X4= ?



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#### Give two important uses of a plane mirror?



same ans

Asked by Rohit Kumar

Nov 3, 2014

#### What is the difference between an open circuit and a closed circuit?



open circuit is a circuit which is not completed.
closed circuit is a circuit which is closed

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