Question

Two lenses of power +12d and -2d are combined together. What is their equivalent focal lenght]

Answer 1

Answer:

TOTAL POWER=P

P=P1+P2

P=12d+(-2d)

P=12d-2d

P=10DIOPTRE

POWER =RECIPROCAL OF FOCAL LENGTH

I.E. P =1/F

10=1/F

10F=1

F=1/10

F=FOCAL LENGTH

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Answer 2

The focal length is 0.1 meter.

Step-by-step explanation:

Given : Two lenses of power +12d and -2d are combined together.

To find : What is their equivalent focal length ?

Solution :

Two lenses of power +12d and -2d are combined together.

Total power of the lens is

$P=+12+(-2)$

$P=12-2$

$P=10$

We know that,

Focal length is inversely proportional to power.

i.e. $f=\frac{1}{P}$

$f=\frac{1}{10}$

$f=0.1\ m$

Therefore, the focal length is 0.1 meter.

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