Question

The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object?
A. Between the principal focus and centre of the curvature
B. At the centre of curvature
C. Beyond the centre of curvature
D. Between the pole of the mirror and its principal focus

Answer 1

Hint: Virtual image is formed from points from which divergent rays seem to emanate without actually doing so. Virtual image is not obtained on the screen. Plane mirror forms a virtual image.

Complete answer:
Spherical mirrors are the mirrors formed by cutting out a piece of a sphere and silvering either the inside or outside surface. There are two types of spherical mirrors: Concave and Convex mirror.

A concave mirror or converging mirror, is a spherical mirror in which the outer surface is polished and the reflecting surface is towards the centre of curvature. A convex mirror or diverging mirror has inner surface polished and reflecting surface bulges outward.
Concave mirrors show different image types depending on the distance between the object and the mirror.

The image of the object can be reduced, enlarged, or of the same size as that of the object based on object position from the mirror.Concave mirrors can produce both real and virtual images depending on the position of the object from the mirror.When the object is located between the principal focus and pole, the will always be located on the opposite side of the mirror.

In this case, the image formed will be an upright image and image dimensions are larger than object dimensions i.e. image formed is magnified. Light rays from the point on the object reflect off the mirror and diverge upon reflection.Therefore, the answer to the above question is between the pole of the mirror and its principal focus.

Hence, the correct answer is option D.

Note:Concave mirrors are used in shaving mirrors, solar cookers, torches, etc.Concave mirrors are used by dentists as they produce a magnified image of the object.Concave mirrors are used to gather light from a small source and direct it outward in a beam.