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A single bi-concave lens (a lens with two concave surfaces) made of fused quartz (index of...

A single bi-concave lens (a lens with two concave surfaces) made of fused quartz (index of refraction n = 1.46) has surfaces with radii of curvature r1 = -27.0 cm and r2 = 27.0 cm.
a)What is the focal length of the lens in air?
b)If an object is placed at p = 14.0 cm from the lens, where is the image? (Use a positive sign for a real image or a minus sign for a virtual image.)
c)If the object has a height of h = 1.80 cm, how large is the image? (Use a positive sign for an upright image or a minus sign for an inverted image.)

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