A convex lens of focal length 20 cm produces images of the same magnification 2 when an object is kept at two distance `x_(1)` and `x_(2)(x_(1)gtx_(2))` from the lense. The ratio of `x_(1)` and `x_(2)` if
A concave lens of focal length f produces an image (1)/(4) of the size of the object, the object should be kept at ____ from the lens.
Two convex lenses of focal lengths f_(1)andf_(2) form images with magnification m_(1)andm_(2) , when used individually for an object kept at the same distance from the lenses. Then f_(1)//f_(2) is
A convex lens of focal length 20 cm and a concave lens of focal length 10 cm are placed 20 cm apart. In between them an object placed at distance x from the convex lens. What is the value of x (in cm ) so that images from by both the lenses coincides ?
A convex lens of focal length 20 cm and a concave lens of focal length 10 cm are placed 20 cm apart. In between them an object placed at distance x from the convex lens. What will be the linear magnification produced convex lens and concave lens individually ?
An object is kept in front of a lens of focal length-20 cm . Describe the nature of the image when the object distance is 25 cm.
