If 'f' is the focal length of a lens then prove `uv=f^2`. U and V represent object and image distances from focus respectively.

The focal length of a convex lens is 7 cm. If an object be kept at 10 cm distance then the image formed-

When an object is placed 20 cm away from a convax lens, no image is obtained on either side of the lens. What is the focal length of the lens? If the refractive index of glass with respect to air is 1.5, what is the refractive index of air with respect to glass?

The focal length of a concave mirror is f. A point object is placed beyond the forcal length at a distance xf from the focus. Prove that the image will be formed beyond the focal length at a distanfe (f)/(x) from the focus and the magnification of the image will be -(1)/(x) .

The focal length of a concave mirror is f. A point object is placed at a distance of xf on the right side of the focus. The image will be formed on the right side of the focus at a distance of

The focal lengths of the lenses of the objective and eyepiece of a microscope are 2 cm and 5 cm respectively. The distance between them is 20 cm . At what distance from the objective should the object be placed so that the final image is formed 25 cm from the eyepiece ? what will be the magnification ?

The focal length of a concave mirror is f . What will be the magnification of an object at a distance x from the principal focus (given, object distance gt f)? For what value of x will the size of the object and the image be the same?

The focal length of a concave mirror is f. A point object is placed at a distance of xf on the right side of the focus. The magnification of the image will be

If a graph is drawn taking x and y as the object distance and the image distance respectively from the focus of a spherical mirror, the graph will be a

The focal lengths of the objective and the eyepiece of a compound microscope are 2m and 5 cm respectively. The distance between the two lenses is 20 cm . Final image is formed at 25 cm distance from the objective calculate the distance between eyepiece and final image.

The focal lengths of the two lenses of a compound microscope are 0.5 cm and 1 cm respectively . An object is placed at a distance of 1 cm from the objective. If the final image of the object is formed at a distance of 25 cm from the eye , what is the distance between the two lenses and the magnifying power of the microscope ?