A A real
image, 1/5th the size of the object is formed
when an object is placed at a distance of 5 cm from a
concave land and calculate it's focal length. If possible then reply me fast please.
Answers
Answered by
1
Answer:
Explanation:
Given: a real image is
5
1
th
the size of the object, and it is formed at a distance of 18cm from the mirror.
To find the focal length of the mirror and the nature of the mirror.
Solution:
According to the given criteria,
image distance, v=−18cm
magnification, m=−
5
1
as the image formed is real hence it will be inverted.
We know,
m=−
u
v
⟹−
5
1
=−(
u
−18
)
⟹u=−(5×18)=−90cm
Applying the lens formula,
f
1
=
v
1
+
u
1
⟹
f
1
=
−18
1
+
−90
1
⟹
f
1
=
90
−5−1
⟹f=−15cm
Since focal length is negative, therefore it is a concave mirror.
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