What is the magnification of convex lens?
A convex lens can form virtual as well as real images, so the magnification produced by a convex lens can be either positive or negative. Magnification is positive for virtual image and negative for real image.
What is the formula of 1 F?
Ans. According to the convex lens equation, 1/f = 1/v + 1/u. It relates the focal length of a lens with the distance of an object placed in front of it and the image formed of that object.
What does UV and F stand for?
The relation between u,v and f for a mirror given by. (A) f=u×vu−v. When the image distance is positive, the image is on the same side of the mirror as the object, and it is real and inverted. Positive means an upright image.
What is the value of v and u?
The values of u and v will be same for point A. So the coordinates of point A must be (2 f, 2 f) because for a concave mirror u and v are equal only when the object is placed at the centre of curvature. of observations from the table. Draw straight lines joining u1 with v1, u2 with v2, u3 with v3 etc.
What is the value of U in concave mirror?
For point A, the values of u and v will be the same. The coordinates at A is (2f, 2f) as u and v are same for a concave mirror when the object is placed at the centre of curvature. Hence, u = v = R = 2f.
What is the value of V in concave lens?
negative
What is the value focal length of concave mirror?
10 cm is the focal length of the concave mirror.
Can focal length of concave mirror be positive?
f, the focal length, is positive for a concave mirror, and negative for a convex mirror. When the image distance is positive, the image is on the same side of the mirror as the object, and it is real and inverted. A negative m means that the image is inverted. Positive means an upright image.
What is the focal length of convex lens?
For a thin lens in air, the focal length is the distance from the center of the lens to the principal foci (or focal points) of the lens. For a converging lens (for example a convex lens), the focal length is positive and is the distance at which a beam of collimated light will be focused to a single spot.
Why We Take focal length of convex lens is positive?
Convex lens converges incident rays. Hence the rays to converge at a point in front of the lens. So image distance is positive here. We can easily clarify that the focal length is positive direction for a Convex lens while negative with concave lens.
Why do we use convex lens to find the focal length of a concave lens?
As a concave lens always forms a virtual image, its focal length can not be found directly as for a convex lens. The concave lens diverges the rays and the image is now formed at I’ as shown in ray diagram. For concave lens, I is the virtual object and I’ is the real image. Hence, O2I = u and O2I’ = v.