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If the Object is Moved to a Point Only 3 Cm Away from the Lens, What is the New Position, Height and Nature of the Image? - CBSE Class 10 - Science

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Question

If the object is moved to a point only 3 cm away from the lens, what is the new position, height and nature of the image? 

Solution

 Object distance (u) =-3 

`1/f=1/v-1/u` 

`1/8=1/v-1/-3` 

`1/8=1/v+1/3` 

`1/8-1/3=1/v` 

`(3-8)/24=1/v` 

`-5/24=1/

`v=-24/5` 

`v=-4.8`cm 

The image will be at a distance of 4.8 cm in front of the lens. 

Magnification `(m) v/u` 

   `m=(-4.8)/-3` 

     m=1.6 

Positive value of magnifiction shows that the image is virtual and erect. 

`m=h_i/h_o` 

`1.6=h_i/3` 

`h_i=3xx1.6=4.8` cm 

positive sign of the image shows that the image will be formed above the principal axis.

  Is there an error in this question or solution?

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Solution If the Object is Moved to a Point Only 3 Cm Away from the Lens, What is the New Position, Height and Nature of the Image? Concept: Refraction of Light - Image Formation by Lenses - Convex Lens.
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