A lens made of fused quartz n 1 46 has
A lens made of fused quartz (n = 1.46) has a focal length of +45 when it is in air.
(a) If the lens is immersed in oil (n = 1.50), the lens will (1) remain con-verging, (2) become diverging, (3) have an infinite focal length. Explain.
(b) What is the focal length when it is in oil?
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