Object and Lens Placed in Water

Physics

example

Focal Length of a combination of lenses immersed in a medium

Example: The two surfaces of a biconvex lens has same radii of curvatures. This lens is made of glass of refractive index and has a focal length in air. The lens is cut into two equal halves along a plane perpendicular to its principal axis to yield two plano-convex lenses. Then they are put in contact with their convex surfaces touching each other.  If this combination lens is immersed in water (refractive index), then find its focal length (in ).                       
Solution:
and
of 2 plano convex lenses of a biconvex lens 
So, = =
And,

example

Example using lens formula

An object is situated at a distance of 15cm from a convex lens of focal length 30 cm. The position of the image formed by it will be





REVISE WITH CONCEPTS

Calculation of Focal Length for Combination of Mirror and Lens

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Problems in Lenses and Mirrors - Problem L1

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