Question

Which mirror is shown in the figure. Where is the object placed with respect to the mirror? Write one characteristic of the image formed.

Answer 1

Hint:When the object is placed between principle focus and pole of a concave mirror, an enlarged virtual and erect image is formed behind the mirror and we have different positions under which image of an object is formed virtually incase of a concave mirror when object is placed in front of a concave mirror.

Complete step by step answer:
If the inner side of the spherical mirror is reflecting, it is called a concave mirror.According to the diagram shown, the inner side reflects the rays. Hence, the mirror is concave. In the diagram it is clear that the image is formed between pole and $\infty $. So, the object is placed between principle focus and pole. From the properties of a concave mirror, if the image is formed between principal focus and pole, then the image will be enlarged, virtual and erect.

Note: In order to solve the mirror problems, we have to know about the type of mirror and their characteristics for e.g. If concave mirror is given, then position of object & image are given as

Object	Image	Nature of Image
$ - \infty $	$ - f$	Point image
$ - \infty < O < - 2f$	$ - 2f < I < - f$	Real, inverted, smaller
$O = - 2f$	$I = - 2f$	Real, inverted, smaller
$ - 2f < O < - f$	$ - \infty < I < - 2f$	Real, inverted, larger
$ - f < O < P$	$P < I < \infty $	Virtual, erect, larger