10th Class Science Solved Paper - Science-2017 Delhi Set-I

  • question_answer An object is placed at a distance of 30 cm in front of a convex mirror of focal length 15 cm. Write four characteristics of the image formed by the mirror.

    Answer:

    Given: \[u=-30\,cm,\,f=15\,cm\]
    We know that, \[\frac{1}{v}+\frac{1}{u}=\frac{1}{f}\]
                                        \[\frac{1}{v}=\frac{1}{15}+\frac{1}{30}=\frac{2+1}{30}=\frac{3}{30}\]
                                        \[v=\,10\,cm\]
    Characteristics of image:
    (i) Image formed is erect.
    (ii) Image formed is small in size.
    (iii) Image formed is virtual.
    (iv) Image is formed at a distance of 10 cm behind the mirror between focus and pole.
     


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