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Answer 1

Answer:

The power of the lens is known as the inverse of the focal length of the lens measured in meter(m). Power of lense = 1/ focal length in meter. A concave lens has a negative focal length. Therefore, it is a concave lens.Find the focal length of a lens of power – 2.0 D. What type of lens is this?

There are two kinds of internal combustion engines currently in production: the spark ignition gasoline engine and the compression ignition diesel engine. Most of these are four-stroke cycle engines, meaning four piston strokes are needed to complete a cycle.