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You have two lenses A and B of focal lengths +10 cm and –10 cm respectively. State the nature and power of each lens. Which of the two lenses will form a

virtual and magnified image of an object placed 8 cm from the lens ? Draw a ray diagram to justify your answer.


P= f/100     [as f is in cm ]
              FOR FIRST LENS
                                         P= +10/100= +0.1D
               FOR SECOND LENS 
                                                P= -10/100= -0.1D
                Here , D is in dioptres . 
                          So, the diverging lens will always give a virtual and erect and diminished image .


1 4 1
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F rind for lens A = powe r=0.1+
f rind for lens B = power =0.1 -
2 2 2
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