11.
f = 12.2 cm
v = 17.2 cm
a)
using lens formula
1/f = 1/ v - 1/u
1/ 12.2 = 1/17.2 + 1/ u
u = 41.97 cm
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b)
as we know,
m = v / u = h'/h
h' = v h / u
h' = 17.2 * 7.9 / 41.97 = 3.238 mm
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c)
since the image formed right to the lens so it must be real and inverted.
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d)
object and image are opposite side of the lens
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plz post other problems seperately
Comment in case any doubt will reply for sure.. Goodluck
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