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The distance between the ends of an obje...

The distance between the ends of an object

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Two converging lenses have focal length f_1 and f_2 The optical axes of the two lenses coincide. This lens system is used to form an image of an object . It is observed that the size of the image does not depend on the distance between the system and object . The distance between lenses is

The minimum distance between the object and its real image for concave mirror is

The focal lengths of the objective and the eyepiece of a compound microscope are 2.0cm and 3.0cm, respectively. The distance between the objective and the eyepiece is 15.0cm. Th final image formed by the eyepiece is at infinity. The two lenses are thin. The distance, in cm, of the object and the image produced by the objective, mesured from the objective lens, are respectively.

The distance between the object and its real image from the convex lens is 60 cm and the height of image is two times the height of object . The focal length of the lens is

A concave mirror has a focal length 20 cm. The distance between the two positions of the object for which the image size is double of the object size is

A convex lens of focal length f is placed somewhere in between an object and a screen. The distance between the object and the screen is x . If the numerical value of the magnification produced by the lens is m , then the focal lnegth oof the lens is .

The minimum distance between a real object and its real image formed by a thin converging lens of focal length f is

Choose the correct alternative corresponding to the object distance 'u', image distance 'v' and the focal length 'F' of a converging lens from the following . The average speed of the image as the object moves with the uniform speed from distance (3F)/(4) to (F)/(2) is greater than the average speed of the image as the object moves with same speed from distance (F)/(2) "to" (F)/(4) The minimum distance between a real object and its real image in case of a converging lens is 4F where F is its focal length.

A telescope has an objective lens of 10cm diameter and is situated at a distance of one kilometre from two objects. The minimum distance between these two objects, which can be resolved by the telescope, when the mean wavelength of light is 5000 Å , of the order of