English, asked by mdaslam79178, 2 months ago

if the radius of curvature of a leans is 30cm then what is its focal length? ​

Answers

Answered by sabaparveen180296
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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