[" lens forms a real image "3cm" high of an object "1cm" high.If the separation of object and image is "15cm],[" d the focal length of the lens."]

A lens forms a real image 3 cm high of an object 1 cm high. If the separation of object and image is 15 cm, find the focal length of the lens.

A cocave lens forms the image of an object such that the distance between the object and image is 10 cm and the magnification produced is 1/4. the focal length of the lens will be

A cocave lens forms the image of an object such that the distance between the object and image is 10 cm and the magnification produced is 1/4. the focal length of the lens will be

A concave lens forms the image of an object such that the distance between the object and image is 10 cm and the magnification produced is 1//4 . The focal length of the lens will be

A concave lens forms the image of an object such that the distance between the object and image is 10cm and the magnification produced is 1/4. The focal length of the lens will be

An erect image 2.0 cm high is formed 12 cm from a lens, the object being 0.5 cm high. Find the focal length of the lens.

Real image of an object are formed on the fromed on the two positions of a lens separated by a distance 60cm If the distance between object and screen is 180cm then ,the focal length of the lens is:

An object is placed at a distance of 30 cm from a convex lens. A real image of magnification 1.5 is formed. Find the location of the image and the focal length of the tens.