Question

Please use PYTHON programming to present the answer. The following subjects and grades are listed in the photo attached. Use the formula below to calculate the CGPA

Answer 1

Answer:

Consider two lenses A and B of focal length f1 and f2 placed in contact with each other. Let the object be placed at a point O beyond the focus of the first lens A (Fig.). The first lens produces an image at I1. Since image I1 is real, it serves as a virtual object for the second lens B, producing the final image at I. It must, however, be borne in mind that formation of image by the first lens is presumed only to facilitate determination of the position of the final image. In fact, the direction of rays emerging from the first lens gets modified in accordance with the angle at which they strike the second lens. Since the lenses are thin, we assume the optical centres of the lenses to be coincident. Let this central point be denoted by P. For the image formed by the first lens A, we get, If the two lens-system is regarded as equivalent to a single lens of focal length f, we have The derivation is valid for any number of thin lenses in contact. If several thin lenses of focal length f1, f2, f3,... are in contact, the effective focal length of their combination is given by where P is the net power of the lens combination. Note that the sum in Eq. (4) is an algebraic sum of individual powers, so some of the terms on the right side may be positive (for convex lenses) and some negative (for concave lenses). Combination of lenses helps to obtain diverging or converging lenses of desired magnification.Read more on Sarthaks.com - https://www.sarthaks.com/429026/derive-an-expression-for-the-effective-equivalent-focal-length-of-two-thin-lenses-contact