Question

ote:
The radii of curvature of the surface of a double convex lens are 25 cm and -25 cm. Th
efractive index of the material of the lens is 1.5. Find the power of the lens.
(a) 2 diopters
(b) 4 diopters
(c) 6 diopters​

Answer 1

Answer:

Correct option is

A

2.5 D

P=

f

1

=(μ−1)[

R

1

1

−

R

2

1

]

Here, μ=1.5,R

1

= 40 cm = 0.4cm ,R

2

= -0.4 cm

P=(1.5−1)[

0.4

1

+

0.4

1

]=2.5D

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