In the case of conservative forces

An object is put at a distance of 5 cm from the first focus of a convex lens of focal length 10 cm. If a real image is formed, its distance from the lens will be

A convex lens of power&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mo>+</mo><mn>6</mn></math>&nbsp;dioptre is placed in contact with a concave lens of power&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mo>-</mo><mn>4</mn></math>&nbsp;dioptre. What will be the nature and focal length of the combination ?

Which of the following lens is thicker in the middle than the edges?

A convex lens of focal length 10 cm and concave lens of focal length 20 cm are kept 5 cm apart. The focal length of the equivalent lens is

The refraction of light is commonly known as:

In the case of conservative forces

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