Answer:
iven: f=−15
v=−10
From mirror formula,
v
1
−
u
=
f
−10
−15
15
10
u=−30 cm
Explanation:
Focal length (f ) = -15 cm
Distance of image (v) = -10 cm
\(\frac{1}{v} – \frac{1}{u} = \frac{1}{f}\)
1/u = -(1/10) – (1/- 15)
1/u =1/15 – 1/10
1/u = -0.033
u = -30 cm
So, the object is placed 30 cm away from the concave lens.
Ray diagram:

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Answers & Comments
Answer:
iven: f=−15
v=−10
From mirror formula,
v
1
−
u
1
=
f
1
−10
1
−
u
1
=
−15
1
u
1
=
15
1
−
10
1
u=−30 cm
Explanation:
Answer:
Focal length (f ) = -15 cm
Distance of image (v) = -10 cm
\(\frac{1}{v} – \frac{1}{u} = \frac{1}{f}\)
1/u = -(1/10) – (1/- 15)
1/u =1/15 – 1/10
1/u = -0.033
u = -30 cm
So, the object is placed 30 cm away from the concave lens.
Ray diagram: