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Vidisha Barwal Grade: 11
        

A concave mirror produces magnification of 1/2 when an object is placed at a distance  of 50 cm from it. Where should the object be placed so that the virtul image of double the size is formed by the mirror?


Ans: 10cm.

6 years ago

Answers : (2)

SAGAR SINGH - IIT DELHI
879 Points
										

Dear student,


 

















cancave mirror formula

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Askiitians Expert


Sagar Singh


B.Tech, IIT Delhi















6 years ago
vikas askiitian expert
510 Points
										

magnification = v/u = 1/2 = -(h1/h)


         v/-50 = 1/2


          v =-25cm


 1/v + 1/u = 1/f


 -1/25 + -1/50 = 1/f


     f = -50/3       (focal length)


let it is placed at u distance from mirror then


  v/u = h1/h = 2             (given)


 v = 2u


applying mirror formula


1/v + 1/u = 1/f


 1/2u + 1/u = 1/f


 3/2u = 1/f


  u = 3f/2


 u = -25cm


thus object should be placed at 25cm from mirror


 

6 years ago
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