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Sudha finds out that the sharp image of ...

Sudha finds out that the sharp image of the window pane of her science laboratory is formed at a distance of 15 cm from the lens. She now tries to focus the building visible to her outside the window instead of the window pane without disturbing the lens. In which direction will she move the screen to obtain a sharp image of the building? What is the approximate focal length of this lens?

Text Solution

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Sudha should move the screen towards the lens so as to obtain a clear image of the building. The approximate focal length of this lens will be 15 cm. The rays of light coming from distant object such as a tree (or a distant building or electricity pole) can be considered to be parallel to each other. When parallel rays of light are incident on a convex lens, the rays, after refraction, converge at focus on the other side of the lens.
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A 4 cm tall object is placed on the principal axis of a convex lens. The distance of the object from the optical centre of the lens is 12 cm and its sharp image is formed at a distance of 24 cm from it on a screen on the other side of the lens. if the object if now moved a little away from the lens, in which way (towards the lens or away from the lens) will he have to move the screen to get a sharp image of the object on it again? How will the magnification of the image be affected ?

A 4 cm tall object is placed on the principal axis of a convex lens. The distance of the object from the optical centre of the lens is 12 cm and its sharp image is formed at a distance of 24 cm from it on a screen on the other side of the lens. if the object if now moved a little away from the lens, in which way (towards the lens or away from the lens) will he have to move the screen to get a sharp image of the object on it again? How will the magnification of the image be affected ?

Knowledge Check

  • An object is placed at a distance of 15 cm from a convex lens of focal length 10 cm. The image obtained on the screen is :

    A
    upright and magnified
    B
    inverted and magnified
    C
    inverted and diminished
    D
    upright and diminished

  • A student obtained a sharp image of the grill of a window in the laboratory on a screen, using a convex lens. For getting better results, her teacher suggested focussing of a distant tree instead of the grill. In which direction should the lens be moved for this purpose to get a sharp image on the screen ?

    A
    towards the screen
    B
    away from the screen
    C
    behind the screen
    D
    very far away from the screen

  • A candle is placed at a distance of 20 cm from a converging lens of focal length 15 cm. The image obtained on the screen is:

    A
    upright and magnified
    B
    inverted and magnified
    C
    inverted and diminished
    D
    upright and diminished.

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