Geometrical OpticsMedium
Question
A lens is made of flint glass (refractive index = 1.5). When the lens is immersed in a liqued of refractive index 1.25, the focal length:
Options
A.increases by a factor of 1.25
B.increases by a factor of 2.5
C.increases by a factor of 1.2
D.decreases by a factor of 1.2
Solution
= (μ - 1)
= (1.5 - 1)
= (μg - 1)lμg =
⇒
= 0.5 × 5 = 2.5 fl = 2.5 × fa
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