u=35,v=?,f=20 calculate the missing value of convex lens
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Answered by
18
According to convex lens,
given :-
u = -35 units (object distance is always negative no matter which mirror or lens it is)
f = 20 units (since focal length is positive in convex lens)
v = ?
here we've to find the image distance (v)
using lens formula :- 1/v - 1/u = 1/f
➡ 1/v = 1/f + 1/u
➡ 1/v = (u + f)/fu
➡ v = fu/(u + f)
putting values,
➡ v = (20 × -35)/(-35 + 20)
➡ v = -700/-15
➡ v = 46.6 units (approximately)
hence, the image distance is 46.6 units
Answered by
10
Using formula :-
1/v - 1/u = 1/f
1/v = 1/f + 1/u
1/v = (u + f)/fu
v = fu/(u + f)
Adding values:-
v = (20 × -35)/(-35 + 20)
v = -700/-15
v = 46.6
Answer is 46.6
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