16th of March 2017

The object is placed at a distance of 5/2f from convex lens of focal length f. Where exactly will the image form ? What is its position and the size and nature ?

Punnu Kamdi - Maharashtra - Class X

Thursday, March 16, 2017 at 16:10:PM


Hi Punnu,

Using lens formula,

begin mathsize 12px style 1 over straight v equals 1 over straight f plus 1 over straight u equals 1 over straight f minus fraction numerator 2 straight f over denominator 5 end fraction equals fraction numerator 5 minus 2 straight f squared over denominator 5 straight f end fraction end style

Based on this value, it is not possible to ascertain the position, size, and nature.

Kindly check the question once. Is the object distance 5/2f correct? Or is it 2f/5?

Thursday, March 16, 2017 at 17:53:PM