A convex lens of focal length 10 cm is placed coaxially 5 cm away from a concave lens of focal length 10 cm. If an object is placed 30 cm in front of convex lens, find the position of final image formed by the combined system
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your solution final image infinity
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Answered by
28
hey mate your answer is here....
for a convex lens
u1=-30cm
v1=?
F1=+10cm
USING THE LENS FORMULA
1/F1=1/v1-1/u1
v1=15cm
so image act as virtual image
for a concave lens
for a concave lens
f2=-10cm
V2=?
U2=+10
USING THE LENS FORMULA
1/F2=1/v2-1/u2
V2=infinity
so final image will be formed at infinity
for a convex lens
u1=-30cm
v1=?
F1=+10cm
USING THE LENS FORMULA
1/F1=1/v1-1/u1
v1=15cm
so image act as virtual image
for a concave lens
for a concave lens
f2=-10cm
V2=?
U2=+10
USING THE LENS FORMULA
1/F2=1/v2-1/u2
V2=infinity
so final image will be formed at infinity
sana999:
am i right.....ya wrong
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