Focus and pole

STATEMENT - 1 : Image formed by a convex mirror is always virtual, erect and diminished. STATEMENT - 2 : In case of a convex mirror the image is erect and virutal, when the object is placed between focus and pole. STATEMENT - 3 : In case of a concave mirror the image is real, when the object is placed between focus and centre of curvature.

The position of optical axis N_(1)N_(2) of a spherical mirror, the source and the image are known (as shown in Figure ). Find by construction the positions of the center of the mirror, its focus, and the pole for the cases a. A-source, B-image, B-source, A-image.

Assertion:- The image focus ( 2^(nd) focus) and the object focus ( 1^(st) focus) are on the oppostie side of the biconvex or biconcave lens. Reason:- The radii of curvature of a biconvex lens and biconcave lens are on the opposite side of the lens.

When the N -pole of a bar magnet points towards the south and S-pole towards the north, the null points are at the

A boy of mass 50 kg is climbing a vertical pole at a constant speed. If coefficient of fricition between his palms and the pole is 0.75, then the normal reaction between him and the pole is ("take g "=10m//s^(2))

Fig. shows a concave mirror with its pole at P, focus F and centre of curvature C. Draw ray diagram to show the formation of image of an object OA.

Draw ray diagrams showing the image formation by a concave mirror when an object is placed (a) between pole and focus of the mirror , (b) between focus and centre of curvature of the mirror (c) at centre of curvature of the mirror , (d) a little beyond centre of curvature of the mirror (e) at infinity

The distance between the poles of a horse shoe magnet is 0.1 m and its pole strength is 0.01 amp-m. The induction of magnetic field at a point midway between the poles will be

Two identical thin bar magnets, each of length L and pole strength m are placed at right angles to each other, with the N pole of one touching the S-pole of the other. Find the magnetic moment of the system.

A pole of 50 meter high stands on a building 250 m high. To an observer at a height of 300 m, thebuilding and the pole subtend equal angles. The distance of the observer from the top of The pole