Two similar planoconvex lenses are combined together in three different ways as shown in the adjoining figure. The ratio of the focal lengths in three cases will be

Two thin plano-convex lenses each of focal length f are placed as shown in the figure . The ratio of their effective focal lengths in the three cases is

Two identical slabs of given metal are joined together in two different ways as shown in figure. What is the ratio of the resistance of these two combinations?

Two similar p-n junctions can be connected in three different ways as shown in the figure. The two connections across which the potentional difference is same are. (a)

Two identical slabs, of a given metal are joined together in two different ways, as shown in figure (i) and (ii). What is the ratio of the resistance of these two combinations?

Two identical springs (springs constant K) are connected together in three different ways. In which case will the spring factor of the oscillation of the body be least ?

Two identical thin planoconvex lenses of refractive index n are silvered, one on the plane side and other on the convex side. The ratio of their for lengths is

Two identical thin planoconvex lenses of refractive index n are silvered, one on the plane side and other on the convex side. The ratio of their for lengths is

When two thin lenses are kept in contanct, the focal length of the combination is

When two thin lenses are kept in contanct, the focal length of the combination is