In the following ray diagram are given the position of an object O, image I and two lenses `L_(1)` and `L_(2)`. The focal length of `L_(1)` is also given. Find the focal length of `L_(2)`.

In the following ray diagram the positions of an object O, image I and two lenses L_(1) and L_(2) and a mirror M are given. The focal length of L_(1) is 10 cm. Find the focal length of L_(2) .

In the following diagram are shown the position of an object O, image I and two lenses. The focal length of one lens is also given. Determine the focal length of the other lens.

Use the following ray diagram, Fig. to calculate focal length of lens L_2 . .

In Fig., there are two convex lenses L_(1) and L_(2) having focal lengths F_(1) and F_(2) respectively. The distance between L_(1) and L_(2) will be :

In the figure shown, there are two convex lenses L_(1) and L_(2) having focal. Lengths f_(1) and f_(2) respectively. The distance between L_(1) and L_(2) will be

In the figure shown, there are two convex lenses L_(1) and L_(2) having focal. Lengths f_(1) and f_(2) respectively. The distance between L_(1) and L_(2) will be

Use the following ray diagram, Fig. 6(b).56 to calculate focal length of lens L_(2) .

The length of a metal wire is l_(1) when the tension in it is F_(1) and l_(2) when the tension becomes F_(2) . Find the natural length of wire.

The length of a metal wire is l_(1) when the tension in it is F_(1) and l_(2) when the tension becomes F_(2) . Find the natural length of wire.

In Fig., there are two convex lenses L_1 and L_2 having focal lengths F_1 and F_2 respectively. The distance between L_1 and L_2 will be : .