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Identify the device used as spherical mi...

Identify the device used as spherical mirror or lens in following cases, when the image formed is virtual and erect in each case.
(a) Object is placed between device and its focus, image formed is enlarged and behind it.
(b) Object is placed between the focus and device, image formed is enlarged and on the same side as that of the object.
(c ) Object is placed between infinity and device, image formed is diminished and between focus and optical centre on the same side as that of the object.
(d) Object is placed between infinity and device, image formed is diminished and between pole and focus, behind it.

Text Solution

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(a) Image formed is enlarged and behind in case of concave mirror.
(b)Image formed is enlarged and on the same side as the object in case of convex lens.
( c) Image formed is diminished and between focus and optical centre on the same side as the object in case of concave lens.
(d) Image formed is diminished and between pole and focus, behind it in case of a convex mirror.
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Knowledge Check

  • An object is placed before a convex lens. The image formed

    A
    is always real
    B
    may be real or virtual
    C
    is always virtual
    D
    is always erect

  • An object is placed before a convex lens. The image formed

    A
    is always erect
    B
    may be erect or inverted
    C
    is always inverted
    D
    is always real

  • When an object is placed between the focus and the pole of a concave mirror, the image formed is

    A
    real, inverted and small
    B
    real, inverted and same size
    C
    real, inverted and enlarged
    D
    virtual, erect and enlarged

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    A point object is placed at the focus of a convex mirror the image will be formed at

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