A Double-Convex Lens Is Made of Glass of Index of Refraction

question 23

Multiple Choice

A double-convex lens is made of glass of index of refraction 1.60. If the radii of curvature of the two surfaces are 10 cm and 20 cm, the focal length of the lens in air is

• A) 11.1 cm
• B) -11.1 cm
• C) 25 cm
• D) 33.3 cm
• E) -33.3 cm

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Definitions:

Redundant Electrical Path

An additional pathway in an electrical circuit designed to ensure continuous operation even if one path fails.

Holding Contacts

Electrical contacts in a relay or switch that maintain their state until altered by a specific action, used to hold circuits closed or open.

Energized

Describes an electrical component that is supplied with power and is capable of performing its function or operation.

Normally Open

A configuration in electrical contacts indicating the default state is non-conductive, closing to complete a circuit when activated.