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?
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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:
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