A point source of light is placed on the principal axis between F and 2F of a concave lens. On the other very far , a screen is placed perpendicular to principal axis. As the screen is brought close towards lens

An extended object of size 2mm is placed on the principal axis of a converging lens of focal length 10cm. It is found that when the object is placed perpendicular to the principal axis the image formed is 4mm in size. The size of image when it is placed along the principal axis is "____________" mm.

An extended object of size 2mm is placed on the principal axis of a converging lens of focal length 10cm. It is found that when the object is placed perpendicular to the principal axis the image formed is 4mm in size. The size of image when it is placed along the principal axis is "____________" mm.

If a equiconvex lens of focal length f is cut into two halves by a plane perpendicular to the principal axis, then

If a equiconvex lens of focal length f is cut into two halves by a plane perpendicular to the principal axis, then

In a young’s double slit experiment the distance between slits S1 and S2 is d and distance of slit plane from the screen is D (gtgt d) . The point source of light (S) is placed a distance (d) / (2 ) below the principal axis in the focal plane of the convex lens (L). The slits S1 and S2 are located symmetrically with respect to the principal axis of the lens. Focal length of the lens is f (gtgt d) . Find the distance of the central maxima of the fringe pattern from the centre (O) of the screen.

An object of length 2.5 cm is placed at the principal axis of a concave mirror at a distance 1.5 f. The image height is

A point source of light is placed at a distance of 2f from a converging lens of focal length f. The intensity onteh other side of the lens is maximum at a distance