Question

here is the question :-

A concave mirror has a focal length of 10 cm. Where should an object be placed in front of this concave mirror so as to obtain an image which is real, inverted and same size as the object?

Answer 1

The object should be placed at twice the focus of the concave mirror to obtain same size of the image ... And Real and inverted..

So the Object Should be placed 10 x 2 = 20

Answer 2

Solution :-

When the image formed by a concave mirror is real, inverted and of the same size as the object, then the object must be placed at its centre of curvature (C) . Now, the centre of curvature of a concave mirror is at a distance of 'twice the focal length ' or '2f' . Here,

Focal length = f = 10cm

So, 2f = 2×10cm

= 20cm

Thus, the object should be placed at a distance of 20cm in front of this concave mirror.


Thanks☺️