Question

L7 find the focal length of aclens of Power,
-2.0d. What type of lens in this?
Please help me​

Answer 1

Explanation:

Correct option is

A

60 cm

For the lens in air

f

a

1

=(aμg−1)[

R

1

1

−

R

2

1

]

⇒

15

1

=(1.5−1)[

R

1

1

−

R

2

1

]

⇒

15

2

=

R

1

1

−

R

2

1

When the lens is immersed in water

f

w

1

=(

aμw

aμg

−1)[

R

1

1

−

R

2

1

]

⇒

f

w

1

=

⎝

⎜

⎜

⎛

3

4

1.5

−1

⎠

⎟

⎟

⎞

[

R

1

1

−

R

2

1

]

⇒

f

w

1

[

4

4.5

−1][

R

1

1

−

R

2

1

]

⇒

f

w

1

=

8

1

×

15

2

⇒

f

w

1

=

60

1

⇒f

w

=60cm.

Answer 2

Answer:

sorry richa

ham abhi aap se baat nhai kar paye ge abhi ham math bana rahe hai

sorry

9 baje baat kare ge