Optics Question 696

Question: The plane faces of two identical plano-convex lenses each having focal length of 40 cm are pressed against each other to form a usual convex lens. The distance from this lens, at which an object must be placed to obtain a real, inverted image with magnification one is

[NCERT 1980; CPMT 1981; MP PMT 1999; UPSEAT 1999]

Options:

A) 80 cm

B) 40 cm

C) 20 cm

D) 162 cm

Show Answer

Answer:

Correct Answer: B

Solution:

To obtain, an inverted and equal size image, object must be paced at a distance of 2f from lens, i.e. 40 cm in this case.



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