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A lens has power of -2D. …

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A lens has power of -2D. what is the focal length and nature of the lens? 5 If an object is placed in front of this lens makes an image at 20cm, find the object distance and magnification and nature of image.

    • Posted by Harsh Gupta X 'C' 5 years, 1 month ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Gaurav Seth 5 years ago

    Given, 
    Power of lens, P = - 2 D

    Therefore,

    Focal length,  
    f = 1 / P

    = 1 / 2 m = - 0.5 
    The negative sign of focal length indicates that the lens is concave.

     

    Given f = - 20 cm, (sign convention) , v = - 10 cm

    (∴ image formed by concave lens is virtual)

    By using lens formula, 

    or u = - 20 

    Thus the object is placed at 20 cm from the concave lens  

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