the focal length of convex lens is 15 cm an object is placed at a distance of 25 cm away from the optic center calculate the distance of the image from the object also calculate the magnification About the author Liliana
Answer: Given data, f=15cm v=30cm h=−5cm u=? ⇒ f 1 = v 1 − u 1 ⇒ u 1 = v 1 − f 1 = 30 1 − 15 1 = 30 1−2 = 30 −1 ⇒u=−30cm Also we know that, m= u +v = h h ′ ⇒ 30 −30 = −5 h ⇒h=+5 ∴object height=5cm Reply
Answer:
Given data,
f=15cm
v=30cm
h=−5cm
u=?
⇒
f
1
=
v
1
−
u
1
⇒
u
1
=
v
1
−
f
1
=
30
1
−
15
1
=
30
1−2
=
30
−1
⇒u=−30cm
Also we know that,
m=
u
+v
=
h
h
′
⇒
30
−30
=
−5
h
⇒h=+5
∴object height=5cm