Question

A dermatologist examines a mole on a patient’s skin by using a handheld magnifying glass.

The focal length of this tool is 15 cm and she hold it at 13.5 cm from the mole.

a) Calculate the image distance d_i.

[2]

b) If the mole has a diameter of 5 mm, calculate the size of the image.

[2]

c) What are the properties of the image? Sketch a ray diagram to show the image formation.

[3]

d) She is now holding the magnifying glass further from the mole, in such a way that she

sees a real, inverted image that is 5 mm in diameter. Calculate the new object

distance do.

[3]

Answer 1

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