Question

state the factors on which focal length of lens depend?​

Answer 1

The focal length of a lens depends on the (i) radii of curvatureof its surfaces and (ii) on the index of refraction of the material the lens is made from

Answer 2

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ANSWER:-

The focal length of a lens depends on the -

(i) radii of curvatureof its surfaces

(ii) on the index of refraction of the material the lens is made from.

ADDITIONAL INFORMATION:-

• The focal length of a lens does not depend on the medium in which it is submerged.
• The angle of refraction, and therefore the focal length, will be dependent upon the geometry of the lens surface as well as the material used to construct the lens. Materials with a high index of refraction will have a shorter focal length than those with lower refractive indices.
• The focal length of a lens depends on the color of light because of changing the color the wavelength is changed and hence the change into the point of convergence has appeared.