In displacement method, there are two position of a lens for which we get clear image. First position of the lens is at $40 c m$ from object and second is at $80 c m$ , the focal length of lens is

40 c m

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\frac{40}{3} c m

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80 c m

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\frac{80}{3} c m

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Solution

The correct option is D $\frac{80}{3} c m$
Option D is correct

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In displacement method, there are two position of a lens for which we get clear image. First position of the lens is at 40 cm from object and second is at 80 cm, the focal length of lens is

The correct option is D 803 cmOption D is correct

In displacement method, there are two position of a lens for which we get clear image. First position of the lens is at $40 c m$ from object and second is at $80 c m$ , the focal length of lens is

The correct option is D $\frac{80}{3} c m$
Option D is correct