Consider a system of two lens seperated by distance d.A point object

A convex lens is cut in half along its principal axis and the two halves are separated by a distance of 12cm. An object is placed 6cm in front of the lens as shown in Figure., Two sharp images are formed on the screen placed 80cm from the object. What is the focal length of the lens?

The distance between object and the screen is D. Real images of an object are formed on the screen for two positions of a lens separated by a distance d. The ratio between the sizes of two images will be:

Two point masses m and 4 m are seperated by a distance d on a line . A third point mass m_(0) is to be placed at a point on the line such that the net gravitational force on it zero . The distance of that point from the m mass is

A luminous object and a screen are at a fixed distance D apart. A converging lens of focal length f is placed between the object and screen. A real image of the object in formed on the screen for two lens positins if they are separated by a distance d equal to

A 5.0 diopter lens forms a virtual image which is 4 times the object placed perpendicularly on the principal axis of the lens. Find the distance of the object from the lens.

A converging lens forms a five fold magnified image of an object. The screen is moved towards the object by a distance d=0.5 m, and the lens is shifted so that the image has the same size as the object. Find the power of lens and the initial distance between the object and the screen.

A lens is made of three thin different mediums. Radius of curvature and refractive index of each medium is shown iin Figure., Surface AB is straight. An object is placed at some distance from the lens by which a real image is formed on the screen placed at a distance of 10cm from the lens. Find the distance of the object from the lens.

A convex lens of focal length f produces an image 1/n times than that of the size of the object. The distance of the object from the lens is:

The magnifications for two positions of image of the same lens are 3 and 2, of a fix point object on a fix screen when the distance between the two positions of lens is 30 cm . The focal lengths of the lens is

A thin equiconvex glass lens (mu_(1) = 1.5) of radius of curvature 'R' and a thin plano-concave lens (mu_(2) = 1.4) are kept in contact and the plane surface is silvered. This lens system is placed in air. When a point object is placed at a distance 20 cm from the lens system on its principal axis, the image formed by the lens system coincides with the object. Then the value of radius of curvature 'R' is