Exam 23: Mirrors and Lenses

A 3.0-cm tall statue is 48 cm in front of a convex lens having a focal length of magnitude 20 cm. (a)Is the image of the statue real or virtual? (b)How far is the image from the lens? (c)Is the image upright or inverted? (d)How tall is the image?

An object is placed 10 cm from a convex lens with a focal length of magnitude 20 cm.What is the magnification?

Which statement about a single thin lens is correct?

Which one of the following numbers is the correct magnification produced by a plane mirror?

What is the power of the lens that has a focal length of 40 cm and a diameter if 5.0 cm?

A nearsighted person has a far point that is 4.2 m from his eyes.What focal length lenses must he use in his contact lenses to allow him to focus on very distant mountains?

How far from a +50-mm focal length lens,such as is used in many 35-mm cameras,must an object be placed so it will form a real image that is 3.0 times the size of the object?

When an object is 12 cm in front of a concave spherical mirror,the image is formed 3.0 cm in front of the mirror.What is the focal length of the mirror?

Which one of the following sets of characteristics describes the image formed by a plane mirror?

A 35-mm camera equipped with a 40-mm focal length lens is used to photograph a tree 17 m tall.If a 32-mm high image of the tree on the CCD sensor is required,how far should the camera lens be from the tree?

The eyepiece of a compound microscope has a focal length of 2.50 cm,and the objective has a focal length of 1.60 cm.The two lenses are separated by 14.0 cm.The microscope is used by a person with normal eyes,having a near point at 25 cm.What is the magnitude of the magnification of the microscope?

The image formed in a plane mirror is

An object is placed 50 cm in front of a concave mirror with a focal length of 25 cm.What is the magnification produced by the mirror?

A person jogs toward a plane mirror at a speed of 3 m/s.How fast is he approaching his image in the mirror?

The length of a telescope is 2.00 m and the focal length of the objective lens is 2.0 cm.What is the focal length of the eyepiece?

An object is 10 cm in front of a concave spherical mirror with a focal length of magnitude 3.0 cm.Where is the image?

A microscope has an objective lens of focal length 1.40 mm and an eyepiece of focal length 20.00 mm.It is adjusted for minimum eyestrain for persons with a near point of 25.0 cm.A blood sample is placed 1.50 mm from the objective.How far apart are the lenses?

The objective and the eyepiece of a refracting astronomical telescope have focal lengths of 320 cm and 4.0 cm,respectively.The telescope is used to view Neptune and the final image is set at infinity.The diameter of Neptune is 4.96 × 10⁷ m,and its distance from Earth at the time of observation is 4.4 × 10¹² m.What is the angle (in milliradians)subtended by the final telescopic image of Neptune?

A person uses corrective glasses of power -8.5 D that are worn 2.0 cm from her eye. (a)Is she nearsighted or farsighted? (b)What is her far point without glasses?

A compound microscope has an objective with a focal length of 3.00 mm and an eyepiece of focal length 6.00 cm.It is adjusted for minimum eyestrain for persons with a near point of 25 cm.If the two lenses are separated by 40.0 cm,what is the total overall magnification?