Power of a lens is always reciprocal to the focal length. So, aconvex lens with 50cm focal length has a power of
(1/0.5) Dioptre
What is the power of lens if the 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 a lens having a focal length of a 50 cm B?
∴ The power of lens is
+2D
. Hence option (D) is the correct answer. Note: Keep in mind that while calculating the power of the lens the focal length should be taken in the meter.
What is the power of convex lens of focal length 40 cm?
So, Power of convex lens is
+ 2.5 D
.
What is the power of convex lens of focal length 15 cm?
therefore the power of the lens is
0.067
.
What is the power of lens having a focal length of 50 cm and minus 50 cm?
Power of a lens is always reciprocal to the focal length. So, aconvex lens with 50cm focal length has a power of
(1/0.5) Dioptre(D) or 2D
.
What is the power of a lens of focal length cm?
1 dioptre is the unit for power of a lens whose focal length is 1 meter. Power of a lens=? Hence, the power of the lens is
10 dioptre
.
Is the power of a lens is 2D what is its focal length?
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. Answer: Since,
Power P = -2 D
, Focal length f = 100/(-2) = – 50 cm.
What is the focal length of a lens whose power is 1.5 D?
Find the focal length of the lens. Is the prescribed lens diverging or converging? = 1/+1.5 =
0.67 m
.
What would be the power of a concave lens which has a focal length of 0.5 Metre?
Answer: In the same way, a power of
-2.0D
means a concave lens of focal length -0.5m.
What are the types of convex lens?
- Plano-convex Lens: It is curved outwards from one side and the other side plane. It is positive focal length elements that have one spherical surface and one flat surface. …
- Double Convex Lens: It is curved outwards from both the side. …
- Concave-convex Lens:
What is a convex lens made of?
Typically made of
glass or transparent plastic
, a convex lens has at least one surface that curves outward like the exterior of a sphere. Of all lenses, it is the most common given its many uses. A convex lens is also known as a converging lens.
What is power of a convex lens having focal length 0.4 m?
0.4 = 1/f. f = 1/P. Shift the 0 to the numerator, So it becomes
10/4
.
Which is lens formula?
Let’s see how to use lens formula
(1/v-1/u= 1/f)
to locate images without having to draw ray diagrams.
What is the magnification produced by a concave lens?
When an object is kept in front of a concave mirror, it produces an upright, virtual and reduced in size image which is on the side of the object. As the image produced is reduced in size, hence the magnification produced is
less than 1
as image height is less than the object height. Hence, Option A is correct.
What is power of a concave lens?
The power of a lens is defined as the reciprocal of the focal length. Lens power is measured in dioptres (D). … Diverging (concave ) lenses have
negative focal lengths
, so they also have negative power values.
