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NEET Sample Paper NEET Sample Test Paper-3

  • question_answer
    For a concave mirror of focal length 20cm, if the object is at a distance of 30cm from the pole, then the nature of the image and its magnification will be:

    A)  real and \[-2\]      

    B)  virtual and \[-2\]

    C)  real and \[+2\]           

    D)  virtual and \[+2\]

    Correct Answer: A

    Solution :

        Given that equations (i) 20cm (ii) = 30cm Now, from the mirror formula \[\frac{1}{\upsilon }=\frac{1}{f}-\frac{1}{u}=\frac{1}{-20}-\frac{1}{-30}\] \[=-\frac{1}{60},\,\upsilon =-60\,cm\] \[m=-\frac{\upsilon }{u}=\left( \frac{-60}{30} \right)=-2\] Here, clearly image is real       


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