A point object O approaches a biconvex lens of focal length 40 cm along its optic axiswith a spe...

A point object 'O' approaches a biconvex lens of focal length 40cm along its optic axis with a speed of 10cm/s while the later receeds away from the former with a speed of 4cm/s. Find the speed and direction of motion of the image when the object is at a distance of 60cm from the lens. 4 cm/s 10 cm/s

On an optical bench a point object is placed at the mark of 10 cm, a convex lens of focal length 15 cm, at the mark of 40 cm and a concave lens of focal length 15 cm placed at the mark of 60 cm. The final image formed at the mark of (point object and two lenses are coaxial )

A point object O is placed at a distance of 20 cm from a convex lens of focal length 10 cm as shown in the figure. At what distance x from the lens should a convex mirror of focal length 60 cm, be placed so that final image coincide with the object?

A point object O is placed at a distance of 20 cm from a convex lens of focal length 10 cm as shown in figure. At what distance x from the lens should a concave mirror of focal length 60 cm, placed so that final image coincides with the object ?

An object is placed at 40 cm from a convex lens of focal length 20 cm. State the nature and the size of the image relative to that of the object.

An object O is kept infront of a converging lens of focal length 30 cm behind which there is a plane mirror at 15 cm from the lens.

A concave mirror of focal length 20 cm and a convex lens of focal length 10 cm are kept with their optic axes parallel but separated by 0.5 mm as shown in the figure. The distance between the the lens and mirror in 10 cm. An object of height 3 mm is placed on the optic axis of lens at a distance between the lens and mirror is 10 cm. An object of height 3 mm is placed on the optic axis of lens at a distance 15 cm from the lens. Find the length of the image formed the mirror in mm.

Point object O is placed at a distance of 20cm from a convex lens of focal length 10cm as shown in Figure., At what distance x from the lens should a concave mirror of focal length 60cm, be placed so that the final image coincides with the object?