Find the focal length of a lens of power (-2.0)D. What of lens
Question 16. Find the focal length of a lens of power -2.0 D. What type of lens is this? View Solution. A converging lens has a focal length of 50 cm. The power of this lens is : (a) + 0.2 D (b) - 2.0 D (c) + 2.0 D (d) - 0.2 D. View Solution.
Find the focal length of convex mirror whose radius of ... - Toppr
In order to obtain a magnification of, -1.5 with a concave mirror of focal length 16 cm, the object will have to be placed at a distance : (a) between 6 cm and 16 cm , (b) between 32 cm and 16 cm (c) between 48 cm and 32 cm (d) beyond 64 cm. A spherical mirror forms an image of magnification 3. The object distance, if focal length of mirror is ...
A lens of focal power $$0.5\ D$$ is - Toppr
The astronomical telescope has two lenses of focal powers 0.5D and 20D. Its magnifying power will be : Power of combination of lenses A nd B is 5D. If the focal length of lens A is o.15 find the power and focal lenght of lens B. Two thin lenses of power + 2. 5 D and - 0. 5 D are placed in contact. Find the power of the lens combination.
A student is to find the focal length of - Toppr
A student has obtained an image of a distant on a screen to determine the focal length F 1 of the given lens. His teacher, after checking the image, gave him another lens of focal length F 2 and asked him to focus the same object on the same screen. The student found that to obtain a sharp image, he has to move the lens away from the screen.
Find the focal length and nature of a lens whose optical power is
Find the focal length and nature of a lens whose optical power is −5D. View Solution. Q 2. The power of a lens is - 5D. (i) find its focal length. (ii) name the type of lens. View Solution. Q 3. The power of a combination of two lenses X and Y is 5 D.
Find out equivalent focal length of given lens combination - Toppr
A convex lens of focal length f 1 is kept in contact with a concave lens of focal length f 2. Find the focal length of the combination. Find the focal length of the combination. View Solution
Formula of focal length in convex lens is - Toppr
The focal length f of a mirror is given by 1 f = 1 u + 1 v where u and v represent object and image ...
Focal length of the plano-convex lens is - Toppr
A plano convex lens (focal length f 2, refractive index μ 2, radius of curvature R) fits exactly into a plano-concave lens (focal length f 1, refractive index μ 1, radius of curvature R. Their plane surfaces are parallel to each other. Then, the focal length of the combination will be
A double convex lens has two surface of equal radii
A double convex lens has focal length 25 c m. The radius of curvature of one of the surface is double of the other. The radius of curvature of one of the surface is double of the other. Find the radii, if the refractive index of the material of the lens is 1.5 .
(a) the focal length of the mirror(b) position of image. - Toppr
6. a.An object 4 cm in size is placed at a distance of 25 cm from a concave mirror of focal length 15 cm. Find the position, nature and height of the image. b A converging mirror forms a real image of height 4 cm, of an object of height 1 cm placed 20 cm away from the mirror. Calculate the image distance. What is the focal length of the mirror?