Question

An object 4 cm in size is placed at 25 cm in front of a concave mirror of focal length 15cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image? Find the nature and size of the image?​

Answer 1

Answer:

From the above information,

u=4cm,f=15cm

R=2f=2×15=30cm

And object is placed at 25cm

Means object is placed at between 'f' and ' c'.

So the image get beyond 'c'.

1/f=1/u+1/v

1/25=1/4+1/v

1/v=1/25-1/4

1/v=-21/100

V=-4.6cm

It means the image is inverted and real

Explanation: