A Lens of Focal Length 30

question 110

Multiple Choice

A lens of focal length 30.0 cm is made of a material with index of refraction 1.50. What is the focal length of a lens with the same geometry but is made of material with an index of refraction 2.00?

• A) 40.0 cm
• B) 60.0 cm
• C) 15.0 cm
• D) 22.5 cm

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