Q. 295.0( 5 Votes )

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.

Answer :

Given,

Object distance u= 8 cm


Focal length of A = 10 cm


=


= 0.10 m


Focal length of B = -10 cm


=


= -0.10 m


We know,




Power of lens A = 10 Dioptres.


Since the power of lens A is positive so it is a convex lens.


Similarly,



Power of lens B= -10 Dioptres.


Since the power of lens b is negative so it is a concave lens.


We know that lens formula is:



Substituting the values of lens A in formula








Substituting the values of lens B in above lens formula:














Thus, lens A which is convex will form a virtual and magnified image of an object placed 8 cm from the lens i.e. between focus and pole of lens.


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