Question

Hii !

Establish lens maker's formula by using refraction formula at curved surface . How wavelength o light affects the focal length of the lens ?

Very very important question !
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Answer 1

Explanation:

Consider a point object be placed at O on the principle axis of biconvex lens having radius of curvature R1 and R2 . A ray from point object O incident at a point on first surface , which be retracted and forms an imaginary image I' hivh be treated as object for the 2nd surface and the final image be form at I .

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Answer 2

Answer:

Refraction of Light

Refraction of LightWhen a ray of light travels from one transparent medium into another medium, it bends while crossing the interface, separating the two media. This phenomenon is called refraction.

Image formation by spherical lenses is due to the phenomenon of refraction. The laws of refraction at a plane surface are equally true for refraction at curved surfaces also. While deriving the expressions for refraction at spherical surfaces, we make the following assumptions.

(a) The incident light is assumed to be monochromatic and

(b) The incident pencil of light rays is very narrow and close to the principal axis.

Explanation:

Cartesian Sign Convention

The sign convention followed in the spherical mirror is also applicable to refraction at spherical surface. In addition to this two more sign conventions to be introduced which are:

(a) The power of a converging lens is positive and that of a diverging lens is negative.

(b) The refractive index of a medium is always said to be positive. If two refractions are involved, the difference in their refractive index is also taken as positive.