What is the focal length of 10cm?
A convex lens has a focal length of 10 cm.
What is the power of a convex lens of focal length 10 cm?
<br> `P=1/(f”in metres”)` <br> We get, `P=1/0.1` <br> or `P=(1 xx 10)/(1)` <br> Thus, Power, P=`+10` dioptres (or `+10`D) <br> Thus, the powerof this convex lens is `+10` dioptres which is also written as `+10`D. The plus sign with the power indicates that it is converging lens or convex lens.
What is the formula for double convex lens?
Hence, the expression for the Len’s maker formula in case of a double convex lens is f1=(μ−1)[R1−R1].
What is the focal length of a double convex lens?
The correct answer is 50 cm. So, R2 = – 50 cm. ⇒ f = 50 cm. Hence, the focal length of a double convex length is 50 cm.
Where should the object before a convex lens of focal length 10 cm?
So here f=10 cm and v=-30cm hence from lens -formula. <br> `1/v-1/u=1/f` we have `1/(-30)-1/u=1/10` i.e., u=-7.5 cm <br> So the object must be placed in front of lens at a distance of 7.5 cm (which is `lt f`) from it.
What is the power of convex lens of focal length 40 cm?
Power = 1/focal length = 1/0.04 = 25 D.
What is the power of a lens of f/10 cm?
Solution : (b) Given, f = 10 cm power P =? <br> The power of lens `P = (1)/(“focal length”(m))` <br> `P = (1)/(f(m))` <br>`or ” ” P = (100)/(f(cm)) = (100)/(10) = 10 D`.
Which has greater power a convex lens of focal length 10cm or 20cm?
Expert-verified answer
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.
What is mean by double convex lens?
Double convex lenses have focal points on both sides of the lens; these and the points at twice the focal length are used to locate objects and images. When the object is outside 2F, the image will be between F and 2F on the other side and will be inverted, diminished, and real.
How do you use a double convex lens?
Two Convex Lenses Combination Example – YouTube
What is double focal length?
An object is placed in front of a converging lens at a distance equal to twice the focal length f1 of the lens. On the other side of the lens is a concave mirror of focal length f2 separated from the lens by a distance 2(f1+f2).
What is placed at a distance of 10 cm from a convex mirror of focal length 15 cm find the position and nature of the image?
An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm. Find the position and nature of the image. We can find the position of image by calculating the image distance, v. Thus, the position of image is at a distance of 6 cm from the convex mirror on its right side (behind the mirror).
Where should the object before a convex lens of focal length 10 cm be placed to get a virtual image at a distance of 30 cm from the?
Detailed Solution
∴ The distance at which an object should be placed from a thin convex lens of focal length 10 cm to obtain a virtual image of double of its size is 5 cm.
What is the power of convex lens of focal length 50 cm?
Solution : Power of a lens is always reciprocal to the focal length. <br> So, a convex lens with 50 cm focal length has a power <br> of (1/0.5) Dioptre d or 2D Since, a convex lens is + 2D.
Where will a convex lens of focal length 20cm?
A convex lens of focal length 20 cm is placed coaxially with a convex mirror of radius of curvature 20 cm. The two are kept 15 cm apart from each other. A point object lies 60 cm in front of the convex lens. Draw a ray diagram to show the formation of the image by the combination.
What is the power of concave lens of focal length of 10cm?
Answer: The power of concave lens whose focal length is 10 cm is 10D.
Which lens has greater power a convex of lens focal length 15 cm or convex lens of focal length 20cm?
The convex lens of smaller focal length (= 20 cm) has greater power since focal length is reciprocal of power.
What is the power of a concave lens of focal length 25 cm?
f = -25 cm` As `P = 100/f, f = 100/(-25) = -4 dioptre`.
What is f and 2F in convex lens?
For a converging lens, parallel light rays will converge to a point. This is the focal point (F) of the converging lens. A point that is twice the distance from the lens as the focal point is labeled 2F. Page 7.
What is the formula of 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 a double convex lens?
Bi-Convex (Double-Convex) lenses have the same radius of curvature on both sides of the lens and function similarly to plano-convex lenses by focusing parallel rays of light to a single point. As a guideline, bi-convex lenses perform with minimum aberration at conjugate ratios between 5:1 and 1:5.
When object is placed at 10cm from concave mirror of focal length 10 cm what will be the nature of image?
hence, image position is the 20cm right side from the pole of the concave mirror as shown in the diagram. The image is straight and bigger than the object.
What is the position of image when an object is placed at a distance of 10cm from a convex lens of focal length 15 cm?
The image is formed behind the mirror and it is virtual.
At what distance from a convex lens of focal length 10 cm must an object be placed in order that an image may be formed two times the size of the object hint take m 2?
When an object is placed at 10 cm and 30 cm from a convex lens?
An object is placed 30 cm away from a convex lens of focal length 10 cm and a sharp image is formed on a screen. Now a concave lens is placed in contact with the convex lens. The screen now has to be moved by 45 cm to get a sharp image again. The magnitude of focal length of the concave len is (in cm)