Question

Doctor suggest a lens of power -0.5D to a person, Calculate focal length of lens, name the types of lens.​

Answer 1

Answer:

it is a concave lens, because power, radius of curvature , and focal length of concave lens measured in negative form.

Explanation:

we know that,

Power = 1/f(in meters)

-0.5 = 1/f

f = -1/0.5

f = -2 m

Answer 2

CONCEPT -

We know that the

power of a lens ( P ) = 1 / f

where f : focal length

SOLUTION -

We know that P = -0.5D

so 1/f = -0.5

after calculation we find that,

f = -2 m ( ANSWER 1 )

using the Sign Convention Method -

SINCE f = -ve of the lens, then the lens is a Concave Lens.

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