An object of height 4cm is placed at a distance of 20cm from a concave mirror of focal length 15cm. Find the position, nature and size of the image
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Height of the object=4cm
u=-20cm
f=-15cm
1/f=1/u+1/v
-1/15=-1/20+1/v
-1/15+1/20=1/v
-4/60+3/60=1/v
-1/60=1/v
V=-60cm the image is in the front of the Mirror
To find height of image
Height of image / height of object=-v/-u
HI/4=-30/-20
Minus sign and 0 would be cut
HI=3x4/2
HI=6cm
It is real,inverted and diminished
Hope it helped
u=-20cm
f=-15cm
1/f=1/u+1/v
-1/15=-1/20+1/v
-1/15+1/20=1/v
-4/60+3/60=1/v
-1/60=1/v
V=-60cm the image is in the front of the Mirror
To find height of image
Height of image / height of object=-v/-u
HI/4=-30/-20
Minus sign and 0 would be cut
HI=3x4/2
HI=6cm
It is real,inverted and diminished
Hope it helped
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