Hence, the power of the lens is
10 dioptre
What is meant by power of a lens the focal length of a lens is 10cm write the nature of the lens and find its power?
Given Focal length f = -10cm. = -0.1m. = -10D. The power is -10D and nature is
concave
(Since focal length is -ve).
What will be the focal length of lens where as its power is 10D?
▪️The focal length of the lens is
-200 cm
.It is a concave lens.
What is power of lens of focal length of 20cm class 10?
so, 20 CM in metres= 20/100m=1/5 metres. power of a lens=
1/1/1/5=5 dioptres
……..
Which has a greater power a convex lens of focal length 10cm or a concave lens of focal length 10cm?
We know that Power is inversely proportional to Focal length. Hence more focal length implies less power. Hence Focal length of 10 cm has greater
power than 20 cm
.
Which lens has the power?
The power of a lens is defined as the reciprocal of the focal length. Lens power is measured in dioptres (D).
Converging (convex ) lenses
have positive focal lengths, so they also have positive power values. Diverging (concave ) lenses have negative focal lengths, so they also have negative power values.
Which lens has a positive power?
(a)
Convex lens
has positive power.
What is the focal length if the power of lens is?
The power of a lens is
defined as reciprocal of the focal length of the lens
. A lens of small focal length has a large power of converging or diverging a parallel beam of light. The power of the lens is 1 diopter if its focal length is 1 m.
What is the power of lens of focal length cm?
= 100/50 =
2 dioptre
. The SI unit of power is dioptre.
What is the power of focal length?
The power of a lens is defined as the reciprocal of its focal length in meters, or
D = 1/f
, where D is the power in diopters and f is the focal length in meters.
What is the power of lens if its focal length is 50 cm?
The power of a lens is 1/focal length (measured in meters). So, 50 cm is 1/2 meter, so the power is
-2
; D stands for diopters, the unit of power for lenses. Hence, the power of a concave lens of focal length 50 cm is -2D.
What is the power of lens if focal length is 20 cm?
The power of a lens of focal length 20cm is
5D
.
So both lenses have same convergence of refracted light. The diopter is the unit of measure for the refractive power of a lens. The power of a lens is defined as the reciprocal of its focal length in meters or D = 1/f.
Is the power of a lens is 2D What is the focal length?
Answer: Power of a lens is -2D, negative sign indicates it is a Concave lens. Focal length (in meters)=1/power of the lens, thus focal length=1/2=0.5m=
50cm
.
What is the power of a concave lens of focal length 25 cm?
As we know that the focal length of a convex lens is taken as in positive sign and focal length of a concave lens is taken negative. So, the power of a convex lens is positive, and the power of a concave lens is
negative
. In this question it is given that the lens is convex, and its focal length is $25$ cm.
What is the power of a convex lens of focal length 0.5 m?
Thus, a diverging lens having a focal length of 1 m has a power of -1 diopter, and a converging lens of focal length 0.5 m has a power of
two diopters
.
What is the focal length of a convex lens having power 5.0 D?
∴ Focal length =
20 cm
.
