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When is magnification positive or negati...

When is magnification positive or negative ?

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When the image formed is virtual and erect, magnification is positive. And, when the image formed is real and inverted, magnification is negative.
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Knowledge Check

  • Assertion :- In displacement method of finding focal length of a convex lens, its magnification in a position of lens is -2, then magnification in another position of lens should be -1/2. Reason :- This method can not be applied for concave lens.

    A
    If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
    B
    If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.
    C
    If Assertion is True but the Reason is False.
    D
    If both Assertion & Reason are False.

  • Assertion: In displacement method of finding focal length of a convex lens its magnification in one position of lens is +2, then magnification in another position of lens should be -1/2. Reason:This method can't be applied for a concave lens.

    A
    If both Assertion and Reason are true and the Reason is correct explanation of the Assertion.
    B
    If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
    C
    If both Assertion is true, but the Reason is false.
    D
    If both Assertion is false but the Reason is true.

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    (a) How will you distinguish between convex lens without touching them? (b) Linear magnification of a concave lens is always positive, whereas that of a convex lens can be both, positive or negative . Why?

    (i) If a xx(-1)=-30, is the integer a positive or negative? (ii) If a xx(-1)=30, is the integer a positive or negative?

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