Question

A 3 cm. "tall" object is placed 25 cm. from a convex lens with a focal...

A 3 cm. "tall" object is placed 25 cm. from a convex lens with a focal length of 50 cm. Determine at what distance a focused image will appear. Determine the height of this image. Create a sketch (ray diagram) showing the scenario described above labeled as “A” and a scenario where everything is the same except the focal length of the lens is changed to 12.5 cm.

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Answer #1

Thin lens formula ( real positive sign convention)

Focal length of lens is

Magnification

Height of the image is

Image is virtual and upright.

Size of image is double that of object.

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Focal length of lens is , object distance

( positive sign of v indicates real image)

Magnification

Height of the image is

(negative sign of hi indicates inverted image) and size of image is same as that of object.

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