The focal length of a-convex lens is f. Show that if the object distance is `(f+f/N)` then the images will form N times magnified in both cases.

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

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

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 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?

If the focal length of objective lens is increased then magnifying power of the

An object is approaching a convex mirror. The ratio of the velocity of the object and that of the object image which is m times magnified is

An object is placed at a distance of 5 cm from the objective of a compound microscope . If the final image is formed at the least distance of distinct vision and coincides with the object then calculate the focal lengths of the objective and the eyepiece . given that the least distance of distinct vision =25 cm and the magnifying power of the instrument = 15 cm.

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 lengths fo the lens of a simple microscope is 5 cm . If the lens is held near the eyes the image is formed at 25 cm . i.e ., at the least distance of distinct vision. What is the magnifying power of the instrument ?

The focal length of a concave mirror is 20 cm . Where should an object be placed to get an image magnified twice?