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A doctor examines a mole with a 20 cm focal length magnifying glass held 15 cm...

A doctor examines a mole with a 20 cm focal length magnifying glass held 15 cm from the mole. (a) Find the image distance.
(b) What is its magnification?
(c) How big is the image of 8 mm diameter mole?

(d) Draw a labelled ray diagram for the questions above (a to c).
(e) Find the power of the magnifying glass.
(f) Find the index of refraction of the material of the magnifying glass if the wavelength of light in it is 0.6 times its value in a vacuum (660 × 10-9 m).
(g) If the speed of light in vacuum is 3 × 108 m/s, find its frequency in the vacuum from the information given in part (f) above.

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