A Lens Has a Focal Length of 60 Cm in Air.If

question 47

Multiple Choice

A lens has a focal length of 60 cm in air.If this lens were immersed in water,what focal length would result? The index of refraction of the lens is 1.500 and that of water is 1.333.The focal length of a thin lens with index n₁ submerged in a liquid with index n₂ is given by the modified lens maker's formula: .

• A)240 cm
• B)68 cm
• C)53 cm
• D)15 cm

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