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CBSE Class 10 Answered

<div><strong>How to derive the Lens Formula ?</strong></div>
Asked by tanishqa.rathod | 13 Dec, 2015, 11:30: AM
Expert Answer

 

The figure above shows that formation of a real, inverted and diminished image A’B’ of the object AB placed beyond the centre of curvature at a distance u from the convex lens. Let v be the image distance. 

According to Cartesian sign convention,

Object distance (OB) = -u

Image distance (OB’) = +v

Focal length (OF1 = OF2) = +f

From geometry of figure above, right angle ΔABO and ΔA’B’O are similar.
 
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