Questions from College Physics

Q: A stamp collector uses a lens with 7.5-cm

A stamp collector uses a lens with 7.5-cm focal length as a simple magnifier. The virtual image is produced at the normal near point (25 cm). (a) How far from the lens should the stamp be placed? (b)...

Q: When a drop of water is placed on a flat, clear

When a drop of water is placed on a flat, clear surface such as a glass slide or plastic sheet, surface tension pulls the top surface into a curved, lens-like shape so that the drop functions as a sim...

Q: A biology student uses a simple magnifier to examine the structural features

A biology student uses a simple magnifier to examine the structural features of an insect’s wing. The wing is held 3.50 cm in front of the lens, and the image is formed 25.0 cm from the eye. (a) What...

Q: A jeweler’s lens of focal length 5.0 cm is used

A jeweler’s lens of focal length 5.0 cm is used as a magnifier. With the lens held near the eye, determine (a) The angular magnification when the object is at the focal point of the lens and (b) The a...

Q: A leaf of length h is positioned 71.0 cm in

A leaf of length h is positioned 71.0 cm in front of a converging lens with a focal length of 39.0 cm. An observer views the image of the leaf from a position 1.26 m behind the lens, as shown in Figur...

Q: (a) What is the maximum angular magnification of an eyeglass

(a) What is the maximum angular magnification of an eyeglass lens having a focal length of 18.0 cm when used as a simple magnifier? (b) What is the magnification of this lens when the eye is relaxed?...

Q: The desired overall magnification of a compound microscope is 140x. The

The desired overall magnification of a compound microscope is 140x. The objective alone produces a lateral magnification of 12x. Determine the required focal length of the eyepiece.

Q: The distance between the eyepiece and the objective lens in a certain

The distance between the eyepiece and the objective lens in a certain compound microscope is 20.0 cm. The focal length of the objective is 0.500 cm, and that of the eyepiece is 1.70 cm. Find the overa...

Q: Find the magnification of a telescope that uses a 2.75

Find the magnification of a telescope that uses a 2.75-diopter objective lens and a 35.0-diopter eyepiece.

Q: A microscope has an objective lens with a focal length of 16

A microscope has an objective lens with a focal length of 16.22 mm and an eyepiece with a focal length of 9.50 mm. With the length of the barrel set at 29.0 cm, the diameter of a red blood cell’s imag...