An eyepiece of a telescope consists of two plano-convex lenses `L_(1)` and `L_(2)` each of focal length f separated by a distance of 2f/3. where should `L_(1)` be plaecd relative to the focus of the objective lens of the telescope so that the final image through `L_(2)` is seen at infinity ?

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 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 : .

Two convex lenses of focal length f_1 and f_2 are mounted coaxially separated by a distance. If the power of the combination is zero, the distance between the lenses is

Two convex lenses of focal lengths f_(1) and f_2 are separated co-axially by a distance d. The power of the combination will be one if

In the figure given below there are two convex lenses L1 and L2 having focal lengths F1 and F2 respectively. The distance between L1 and L2 will be

A compound microscope consists of an objective of focal length 1 cm and an eyepiece of focal length 5 cm. An object is placed at a distance of 0.5 cm from the objective. What should be the separation between the lenses so that the microscope projects an inverted real image of the object on a screen 30 cm behind the eyepiece?

A telescope consists of two lenses of focal lengths 10cm and 1cm . Calculate the length of the telescope, when an object is kept at a distance of 60cm from the objective, and the final image is formed at least distance of distinct vision.