If an object is placed at the focus of a concave mirror, where is the image formed?

(b) – 20 cm is the correct option.

Hint— Draw ray diagrams separately indicating the direction of incident and reflected rays.

(d) When an object is placed between the pole and principal focus of a concave mirror, the image formed is virtual, erect, and larger than the object.

Here, in case of concave mirror u=10 cm [u, is always negative] v =?;m = - 3 [real image] Now the magnification formula is m= -v/u or -3= -(v/-10) or , v = -30 cm. Image will...

The image formed by a concave mirror is virtual, erect and larger only when the object is placed between the pole of the mirror and its principal focus. So correct...

The virtual image formed by a concave mirror is always magnified whereas the virtual image formed by a convex mirror is diminished.

Virtual and erect.

(c) both concave mirror and convex lens.

(a) Virtual image formed is larger in size in case of concave mirror.

(a) Real, inverted and same in size because object is at the centre of curvature of the mirror.