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  3. RAJASTHAN ­ PET

RAJASTHAN ­ PET Rajasthan PET Solved Paper-2003

  • question_answer
    The object at distance of 20 cm is placed in front of convex lens of focal length 10 cm, where will be image formed?          

    A)  10 cm            

    B)  20 cm        

    C)  5 cm           

    D)  25 cm        

    Correct Answer: B

    Solution :

     Given, \[f=10\text{ }cm,\text{ }u=-20\text{ }cm\] \[\therefore \] \[\frac{1}{f}=\frac{1}{v}-\frac{1}{u}\] \[\Rightarrow \] \[\frac{1}{10}=\frac{1}{v}-\left( -\frac{1}{20} \right)\] \[\frac{1}{v}=\frac{1}{10}-\frac{1}{20}=\frac{1}{20}\] \[v=20cm\]


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