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CBSE > Class 10 > Science 3 answers; Abhay Soni 3 weeks, 4 days ago (a) This is because a concave lens forms a virtual and erect image for any position of the object. False Question 9 The magnification for a concave lens is always reduced. An aspheric biconvex lens. ... 22.A convex lens produces a magnification of +5. At what distance should the object from the lens be placed so that it forms an image at 10 cm from the lens? Note: - If magnification (m) is positive, It means image formed is virtual and erect If magnification (m) is negative, It means image formed is real and inverted Questions Example 10.3 - A concave lens has focal length of 15 cm. For further information on simple optical telescopes, see Refracting telescope § Refracting telescope designs. If the thickness of a lens is negligible in comparison to the radius of curvature, it is a thin lens. Table shows the sign convention for the values of object distance, image distance and focal length. Thus, m = or m = Where, h 2 = size of image h 1 = size of object. Concave lenses always produce images that are upright, virtual, reduced in size, and located on the object's side of the lens. Non spherical types. Thin Lens Formula with Magnification for Concave and Convex Lenses. Linear magnification M is not always the most useful measure of magnifying power. The magnification of a lens may be defined as the ratio of the size (height) of the image to the size (height) of the object. It is a combination of a lens with one convex lens and one concave lens side that is concave-convex lens … ... A convex plus a concave lens (f 1 > 0 > f 2) produces a positive magnification and the image is upright. The following typical equation is used to determine a relation between the focal length of the lens, the distance of the object, and the distance of the image. A concave lens causes light to converge. Magnification produced by a concave lens is always? longer than shorter than equal to inversely proportional to Question 11 A concave lens always produces what type of image? True Question 10 The wavelength of light in a medium is ____ the wavelength of light in a vacuum. It is used to controlling the laser beam. First, what is a thin lens? \( \text{Lens Formula: }\frac{1}{u}+\frac{1}{v}=\frac{1}{f} \) The lens formula may be applied to convex lenses as well as concave lenses provided the ‘real is positive’ sign convention is followed. Concave-convex Lens: It is curved inwards from one side and outwards from one side. It can be used to balance out the spherical aberrations caused by other lenses. linear magnification of a concave lens is always positive and where as that of convex lens has both positive and negative why Report ; Posted by Nikki Jaiswal 3 weeks, 4 days ago. 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