Two identical thin converging lenses brought in contact so that their axes coincide are placed 12.5 cmfrom an object. What is the optical power of the system and each lens, if the real image formed by thesystem of lenses is four times as large as the object?

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Two identical thin converging lenses brought in contact so that their axes coincide are placed 12.5 cm
from an object. What is the optical power of the system & each lens, if the real image formed by the
system of lenses is four times as large as the object?

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Two identical thin converging lenses brought in contact so that their ...

It is given that v = 4u.

Assume that combined focal length is F. So 1/F = 1/f1 + 1/f2 where f1 and f2 are the individual focal length. Since identical lens are used -- the f1 = f2 = f (say). So 1/F = 2/f ---> f = 2F.

Now from lens equation --- 1/v + 1/u = 1/F, putting v = 4u, we get F = 4u/5. Putting u = 12.5, F = 10 cm.

So combined Power is P = 100/F = 10D

Since f = 2F, so f = 2 * 10 = 20 cm. So individual lens power is = 100/20 = 5D

Ans: Optical power of the system is 10 D and power of each lens is 5 D.

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Two identical thin converging lenses brought in contact so that their axes coincide are placed 12.5 cmfrom an object. What is the optical power of the system & each lens, if the real image formed by thesystem of lenses is four times as large as the object?

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Two identical thin converging lenses brought in contact so that their axes coincide are placed 12.5 cmfrom an object. What is the optical power of the system & each lens, if the real image formed by thesystem of lenses is four times as large as the object? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about Two identical thin converging lenses brought in contact so that their axes coincide are placed 12.5 cmfrom an object. What is the optical power of the system & each lens, if the real image formed by thesystem of lenses is four times as large as the object? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Two identical thin converging lenses brought in contact so that their axes coincide are placed 12.5 cmfrom an object. What is the optical power of the system & each lens, if the real image formed by thesystem of lenses is four times as large as the object?.

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