A convex lens produces a real image double the size of the object, when the object is placed at a distance 18 cm from it. Where should the object be placed to produce a real image three times the size of the object?

The ratio of the size of the image to the size of the object is called-

At what distance from a concave mirror an object should be placed to get an image half the size of the object?

A concave mirror forms a virtual image of twice the size of the object placed at a distance of 10 cm from the mirror. If the object is placed at a distance of 30 cm from the mirror where will the image be formed? Formed? What will be the nature of the image formed?

A concave mirror forms a real image of height twice the size of the object. Now the object and the screen are so moved that a real image of height three times the size of the object is formed. If the displacement of the screen is 18 cm, determine the displacement of the object and the focal lenght of the mirror.

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

A convex lens of focal lengths 30 cm produces 5 times magnified real image of an object What is the object distance ?

An object is placed at a distance of 20 cm from a concave mirror of focal lenght 10 cm. What is the image distance?

Find the position of an object which when placed in front of a concave mirror of focal length 20 cm, produces a virtual image which is twice the size of the object.

A real and inverted image of the same size is formed by a concave mirror when the object is placed-