A convergent lens with a focal length of f = 10 cm is cut into two halves that are then moved apart to a distance of d =0.5 mm (a double lens). Find the fringe width on screen at a distance of 60 cm behind the lens if a pont source of monochromatic light `(lambda=5000Å)` is placed in front of the lens at a distance of a = 15 cm from it.

A convergent lens with a focal length of f=10cm is cut into two halves that are then moved apart to a distance of d=0.5 mm (a double lens). Find the fringe width on screen at a distance of 60 cm behind the lens if a point sources of monochromatic light (lambda=5000Å) is placed in front of the lens at a distance of a = 15cm from it.

An object is placed at a distance of 15 cm from a convex lens. If the focal length of the lens is 60 cm, find the image distance.

An object is kept at a distance of 60 cm in front of a convex lens. Its real and inverted image is fonned at a distance of 20 cm from the lens. Find the focal length of the lens.

An object is kept at a distance of 60 cm in front of a convex lens. Its real and inverted image is fonned at a distance of 20 cm from the lens. Find the focal length of the lens.

A lens with a focal length of 25 cm produces real image of an object at a distance of 50 cm from the lens. At what distance the object placed from the lens?

A convex lens of focal length 15 cm is split into two halves and the two halves are placed at a separation of 120 cm. Between the two halves of convex lens a plane mirror is placed horizontally and at a distance of 4 mm below the principal axis of the lens halves. An object AB of length 2 mm is placed at a distance of 20 cm from one half lens as shown in.figure. The final image of the point A is formed at a distance of n/3 mm from the principle axis. Determine the value of n

A convex lens of focal length 15 cm is split into two halves and the two halves are placed at a separation of 120 cm. Between, the two halves of convex lens a plane mirror is placed horizontal and at a distance of 4 mm below the principal axis of the lens halves. An object of length 2 mm is placed at a distance of 20 cm from one half lens as shown in figure. Find the position and size of the final image. Trace the path of rays forming the image.

An object is placed at a distance of 15 cm from a convex lens.If the focal length of the lens is 60cm,find the image distance.