please tell fast question no. 4
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hope this helps..........
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catmat1710:
the formula for focal length is wrong
idk
and the lens is diverging
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here we have to use sign convention with the values of u and v
u=-3m v=-1m
so now the equation for the focal length of the lens is
1/v-1/u=1/f
from here we will get the focal length
i.e.
f=-3/2
so the lens having the focal length is negative are concave lenses(you should know).
the power if 1/f=-2/3.
u=-3m v=-1m
so now the equation for the focal length of the lens is
1/v-1/u=1/f
from here we will get the focal length
i.e.
f=-3/2
so the lens having the focal length is negative are concave lenses(you should know).
the power if 1/f=-2/3.
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