A Lens Is Made of Glass of Refractive Index 1

question 106

Multiple Choice

A lens is made of glass of refractive index 1.50. If both the surfaces are convex and the radii of curvatures are 10 cm and 20 cm, then the focal length of this lens is

• A) 4.45 cm.
• B) 13.3 cm.
• C) -13.3 cm.
• D) 40 cm.
• E) -40 cm.

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Definitions:

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