Question

(a) By stating the sign convention and assumptions made derive thin lens formula for a double convex lens forming virtual image.
(b) The image obtained with a convex lens is erect and its length is four times the length of the object. If the focal length of the lens is 20cm, calculate the object and image distance. OR
(a) What is diffraction? Distinguish between diffraction and interference.
(b) Using Huygen’s principle, explain diffraction of light due to a single slit and explain the formation of the pattern of the fringes obtained on the screen.
(c) Why backward movement of secondary wavelets is not possible?

Answer 1

hey mate here is yr answer