A simple magnifying lens is used in such a way that an image is formed at `25 cm` away from the eye. In order to have 10 times magnification, the focal length of the lens should be

A convex lens is used to obtain a magnified image of an object on a screen 10 m from the lens .If the magnification is 19,find the foal length of the lens.

The objective lens of a compound microscope produces magnification of 10. In order to get an over all magnification of 100 when image is formed at 25 cm from the eye, the focal length of the eye lense should be (in cm)

A convex lens is used to throw on a screen 10 m from the lens, a magnified image of an object. If the magnification is to be 19 , find the focal length of the lens.

A convex lens is used to throw on a screen 10 m from the lens, a magnified image of an object. If the magnification is to be 19 , find the focal length of the lens.

In a simple microscope, if the final image is located at 25 cm from the eye placed close to the lens, then magnifying power is

The objective lens of a compound microscope produces magnification of 10. In order to get an overall magnification of 100 when image is formed at 25cm from the eye, the focal length of the eye lens should be

A convex lens is used to obtain a magnified image of an object on a screen . The object is at a distance 10 m from the lens . If the magnification is 19. the focal length of the lens is