An object is placed at a distance of 30cm from a concave lens of focal length 15cm. List four characteristic (nature, position,etc)of the image formed by the lens
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Answered by
6
Since the object is kept at Centre of curvature ...as radius of curvature =2×focal length ...
Therefore the characteristics of the image are ..
Same size as that of the object
At the centre of curvature itself
Not magnified
Inverted
Simple..
Therefore the characteristics of the image are ..
Same size as that of the object
At the centre of curvature itself
Not magnified
Inverted
Simple..
Answered by
7
u=-30cm
f=-15cm
1/f=1/v-1/u
1/v=1/f+1/u
1/v=1/-15+1/-30
1/v=-2/30-1/30
1/v=-3/30
v=-30/3
v=-10
the image is real and inverted
m=v/u
m=-10/-30
m=1/3=0.33
so the image is diminished too
f=-15cm
1/f=1/v-1/u
1/v=1/f+1/u
1/v=1/-15+1/-30
1/v=-2/30-1/30
1/v=-3/30
v=-30/3
v=-10
the image is real and inverted
m=v/u
m=-10/-30
m=1/3=0.33
so the image is diminished too
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