The slit of a collimator is illuminated by a source as shown in the adjoining figures. The distance between the slit `S` and the collimating lengs `L` is equal to the focal length of the lens. The correct direction of the emergent beam will be as shown in figure.

Find the focal length of the lens as shown in figure.

Calculate the focal length of the lens shown in the figure.

Find the focal length fo the lens shown in the figure.

The graph shown relationship between object distance and image distance for a equiconvex lens. Then focal length of the lens is

The graph shown relationship between object distance and image distance for a equiconvex lens. Then focal length of the lens is

The correct curve between fringe width beta and distance between the slits (d) is figure is -

Figure shows a narrow slit S illuminated b a monochromatic light of wavelength lambda in a double-slit experiment. In the path of the rays reaching the upper slit S_(1) , a tube to length L is interposed in which the index of reflection of the medium varies linearly as shown in figure . The position of the central maximum in the interference pattern on the screen was displaceed by N fringes. Find the value of N in terms of mu_(0) , L and lambda .

Figure shows a narrow slit S illuminated b a monochromatic light of wavelength lambda in a double-slit experiment. In the path of the rays reaching the upper slit S_(1) , a tube to length L is interposed in which the index of reflection of the medium varies linearly as shown in figure . The position of the central maximum in the interference pattern on the screen was displaceed by N fringes. Find the value of N in terms of mu_(0) , L and lambda .

Find the focal length of the lens shown in the figure. The radii of curvature of both the surfaces are equal to R