Answer:
The lens formula is ...(1)
We know that by
convention u is negative
?(2)
from
eqn. (1),
or ?(3)
Equation (3)
is quadratic in u and gives two
valuta of u
say and in terms of
f.
sum
of roots ?(4)
And product
of roots
Also ?(5)
(given)
Adding
(4) and (5), we get,
and
subtracting (4) and (5),
or
Now
or
Shortcut.
Usingwe get
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