As an object is moved from the surface of a thin converging lens to a focal point, over what range does the image distance very?

A point object O moves from the principal axis of a converging lens in a direction OP. I is the image of O, will move initially in the direction

An object is placed 12 cm to the left of a converging lens of focal length 8cm . Another converging lens of 6 cm focal lengh is placed at a distance of 30 cm to the right of the first lens. The second lens will produce

Choose the correct alternative corresponding to the object distance 'u', image distance 'v' and the focal length 'F' of a converging lens from the following . The average speed of the image as the object moves with the uniform speed from distance (3F)/(4) to (F)/(2) is greater than the average speed of the image as the object moves with same speed from distance (F)/(2) "to" (F)/(4) The minimum distance between a real object and its real image in case of a converging lens is 4F where F is its focal length.

The image of the moon is focused by a converging lens of focal length 50 cm on a plane screen. The image is seen by an unaided eye from a distance of 25 cm. Find the angular magnification achieved due to the converging lens.

A point source of light is placed inside water and a thin converging lens of focal length f is placed just outside the surface of water. The image of source is formed at a distance of 50 cm from the surface of water. When the lens is placed just inside the water surface the image is formed at a distance of 40 cm from the surface of water. if focal length of the lens in air is f=(100k)/8 cm, then find the value of k. (given refractive index of lens is 3/2 and that of water is 4/3 and in both cases image is formed inside water for the viewer in air).

An object is kept at a distance of 15 cm from a convex lens of focal length 10 cm. Calculate the image distance and state the characteristics of the image formed.

An object is placed at a distance of 12 cm from a convex lens of focal length 8 cm. Find : the position of the image

An object is placed in front of a converging lens at a distance equal to twice the focal length f_(1) of the lens. On the other side of the lens is a concave mirror of focal length f_(2) separated from the lens is a concave mirror of focal length f_(2) separated from the lens by a distance 2(f_(1)+f_(2)) . Light from the object passes rightward through the lens, reflects from the mirror, passes leftward throught the lens, and forms a final image of the object.

An object is gradually moving away from the focal point of a converging lens along the axis of the lens. The graphical representation of the magnitude of linear magnification (m) versus distance of the object from the lens (x) is correctly given by : (Graphs are drawn schematically and are not to scale)

Where should an object be placed from a converging lens of focal length 20 cm, so as to obtain a real image of magnification 2?