Calculate the information about the lenses available in an optical shop. Find out how the focal length of a lens may be determined by the given power of the lens.

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Concave lens only

Convex lens only

Both lens only

Biconvex, biconcave , plano convex , plano concave

answer is D.

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Detailed Solution

Concept: There are many types of lens available in the optical lens. Like bi-convex and concave and plano concave and convex. Lens can also be defined as positive and negative lenses.
Lenses can be classified as: positive and negative lenses. Converging lenses converge a collimated beam of light to a point back of the lens, with the assume that the beam travels parallel to the lens axis and passes through the lens. Diverging lenses, cause a collimated light beam to diverge and spread behind the lens. The dual types of concave lenses — biconcave and Plano-concave — are negative. Meniscus lenses form a third type referred to as convex-concave lenses and can be either positive or negative, depends on the radius of curvature of the sides of the lens.
Hence, the correct option is 4.

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