image produced by the lens. What happens if the object is moved further away from the lens? . What is the focal length of a convex lens of focal length 30cm in contact with a concave lens of focal length 20cm?
Is the system a converging or a diverging lens? Ignore thickness of the lenses. . A compound microscope consists of an objective lens of focal length .
cm and an eyepiece of focal length . cm separated by a distance of 15cm. How far from the objective should an object be placed in order to obtain the final image at (a) the least distance of distinct vision (25cm), and (b) at infinity? What is the magnifying power of the microscope in each case?
. A person with a normal near point ( cm) using a compound microscope with objective of focal length . mm and an eyepiece of focal length .5cm can bring an object placed at .0mm from the objective in sharp focus. What is the separation between the two lenses?
Calculate the magnifying power of the microscope, . A small telescope has an objective lens of focal length 144cm and an eyepiece of focal length .0cm. What is the magnifying power of the telescope? What is the separation between the objective and the eyepiece?
. (a) A giant refracting telescope at an observatory has an objective lens of focal length 15m. If an eyepiece of focal length .0cm is used, what is the angular magnification of the telescope? (b) If this telescope is used to view the moon, what is the diameter of the image of the moon formed by the objective lens?
The diameter of the moon is . × m, and the radius of lunar orbit is . × m. .
Use the mirror equation to deduce that: (a) an object placed between f and f of a concave mirror produces a real image beyond f. (b) a convex mirror always produces a virtual image independent of the location of the object. (c) the virtual image produced by a