if the radius of curvature of a leans is 30cm then what is its focal length?
Answers
Answered by
1
Explanation:
Correct option is
A
52
Converging lens of focal length = +20cm in air μ
L
=1.6
F
1
=(
μ
M
μ
L
−1)(
R
1
1
−
R
2
1
) = Lens formula
Where μ
L
→ refractive index of lens
μ
M
→ refractive index of medium
In air (μ
M
=1)
20
1
=(
1
1.6
−1)(
R
1
1
−
R
2
1
)
20
1
=0.6(
R
1
1
−
R
2
1
)
12
1
=(
R
1
1
−
R
2
1
)
In liquid (μ
M
=1.3)
F
1
=(
1.3
1.6
−1)(
R
1
1
−
R
2
1
)
F
---
1
=
1.3
---
0.3
×
12
---
1
F
---
1
=
52
---
1
Hence,
new focal length is 52 cm
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