(a) A screen is placed 90 cm from an object. The image of the object on the screen is formed by a convex lens at two different locations separated by 20 cm. Determine the focal length of the lens.

A telescope has an objective of focal length 50 cm and eye piece of focal length 5 cm. The least distance of distinct vision is 25 cm. The telescope is focused for distinct vision on a scale 200 cm away (a) A screen is placed 90 cm from an object. The image of the object [...]

A person with a normal near point (25 cm) using a compound microscope with an objective of focal length 8.0 mm and an eyepiece of focal length 2.5 cm can bring an object placed 9.0 mm from the objective (a) A screen is placed 90 cm from an object. The image of the object on [...]

A compound microscope consists of an objective lens of focal length 2.0 cm and an eyepiece of focal length 6.25 cm separated by a distance of 15 cm. How far from the objective should an object be placed in order (a) A screen is placed 90 cm from an object. The image of the object [...]

A compound microscope uses an objective lens of focal length 4 cm and eye lens of focal length 10 cm. An object is placed 6 cm from the objective lens. (a) Calculate the magnifying power of the compound (a) A screen is placed 90 cm from an object. The image of the object on the [...]

(a) A screen is placed 90 cm from an object. The image of the object on the screen is formed by a convex lens at two different locations separated by 20 cm. Determine the focal length of the lens. (a) A screen is placed 90 cm from an object. The image of the object on [...]