Q1. An object is placed 30 cm in front of a concave mirror of radius of curvature 15 cm. The image formed will be:
A Magnified, real and inverted
B Diminished, real and inverted Correct
C Magnified, virtual and erect
D Of the same size as the object, real and inverted
Explanation
For a concave mirror, the focal length is half the radius of curvature, so here it is 7.5 cm. The centre of curvature is at 15 cm, while the object is at 30 cm, that is, beyond the centre of curvature. In this position, a concave mirror forms an image between the focus and the centre of curvature. Such an image is real, inverted and diminished. A magnified real image would occur when the object is between the focus and the centre; a virtual erect image occurs when it is inside the focus; the same-size case is at the centre.