Forming Real Images with a Converging Lens Place the wire mesh at the 10-cm mark

Question

Forming Real Images with a Converging Lens

Place the wire mesh at the 10-cm mark on the stick (caution: the wire can be sharp). Move the cardboard screen to the 35-cm mark. Position the plug-in lamp to the left of the wire mesh. Place the converging lens just to the right of the mesh. Moving the lens to the right, find and record a position for the lens which gives a real, inverted image of the wire mesh (not thebulb) on the cardboard. Check that all supports are perpendicular to the stick. Verify that the image is inverted by moving a pen or pencil around between the lamp bulb and the mesh. Now move the lens further right to another position and find a second image with a different size.Record the new lens position. For each lens position, calculate the values of object distance d o and image distance d i by subtraction of the positions of the mesh, lens and screen on the scale of the meter stick.

Explain why the lens in Procedure 1.b) forms two different images when moved between the fixed light source and screen.

Explanation / Answer

well, actually when we are changing the position of lens between light source and screen keeping mesh at fixed position , the distance of object from lens is constantly changing therefore imge distance must alos change but since position of screen is fixed therefore all we are getting change in the size of the image hence we are getting two different images for two diffrent positions of lens.

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