Example 1. Solve the following pairs
of equations by reducing them to a pair of
linear equations:
11=2
2x
11_13
3x + 2y6
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Answer:Analyse the following observation (v) object distance (u) image distance find without calculation 1=(v)+25, (u) -100/ 2= (v)-60 and (u)-40 now find the focal length without calculation and also give reason how you find
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