if the image formed by ta lens for all positions of an object placed in front of it is always erect and diminished, what is the nature of this lens? Draw a ray diagram to justify your answer .If the numerical value of the power of this lens is 10D, what is its focal length in the cartesian system
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Lense is Concave lens.
Focal Length =1/Power
=1/10=0.1m
Focal Length =1/Power
=1/10=0.1m
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