At the focal point of a converging lens, the object:
A. appears inverted
B. can be seen normally
C. appears reversed (left/right)
D. cannot be seen


  1. Answer:

    D) Image cannot be seen


    As we know by lens formula

    \frac{1}{d_i} + \frac{1}{d_o} = \frac{1}{f}

    now we know that

    object is placed at the focal point of lens

    d_o = f

    so we will have

    \frac{1}{d_i} = 0

    so the image will form at infinite

    so image will be at infinite distance from the lens

    so it cannot be seen

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