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If a lens is moved towards the object fr...

If a lens is moved towards the object from a distance of 40 cm to 30 cm, the magnification of the image remains the same (numarically). The focal length of the lens is

A

20 cm

B

15 cm

C

35 cm

D

18 cm

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The correct Answer is:
C
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AAKASH INSTITUTE ENGLISH-RAY OPTICS AND OPTICAL INSTRUMENTS-ASSIGNMENT (SECTION - B)
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