Focal length of a convex lense in air is `20cm.` and of concave lens 40cm. Find the position of final image.

A convex lens of focal length 10 cm is placed co-axially 5 cm away from a concave lens of focal length 10 cm . If an object is placed 30 cm in front of the convex lens, find the position of final image formed by the combined system.

Focal length of the convex lens shown in figure is 20cm. Find the image position and image velocity.

Focal length of the convex lens shown in figure is 20cm. Find the image position and image velocity.

Two lenses, one convex and the other concave are kept in contact. The focal length of convex lens is 30cm and that of concave lens is 20 cm. Whaat will be the equibalent focal length of the combination? What will be the nature of the combination?

A convex lens of focal length 10 cm is placed coaxially 5 cm away from a concave lens of focal length 10 cm. If an object is placed 30 cm in front of the convex lens, find the position of the final image formed by the combined system.

A concave and convex lens each of focal length 15 cm are kept 5 cm apart. An object is placed in front of the convex lens at a distance of 60 cm. Determine the position of final image.

Two thin lenses, both of 10 cm focal length- one convex and other concave, are placed 5 cm apart. An object is placed 20 cm in front of the convex lens. Find the nature and position of the final image.

Two thin lenses, both of 10 cm focal length- one convex and other concave, are placed 5 cm apart. An object is placed 20 cm in front of the convex lens. Find the nature and position of the final image.

An object is placed at a distance of 10cm to the left on the axis of convex lens A of focal length 20cm. A second convex lens of focal length 10cm is placed coaxially to the right of the lens A at a distance of 5cm from A. Find the position of the final image and its magnification. Trace the path of the rays.