Exam 32: Optical Images

An object is placed 5 m in front of a converging lens of focal length 11 cm.A diverging lens with focal length 11 cm is placed 6 cm behind the converging lens.Calculate the position of the final image produced by the two-lens system and state if this final image is real or virtual.

To provide large magnification,a telescope should have an objective with a _____ and an eyepiece with a _____.

How much must the focal length of an eye change when an object,originally at 4.00 m,is brought to 40.0 cm from the eye?

A diverging lens has a focal length of magnitude 20 cm.An object is placed 10 cm in front of the diverging lens.Calculate the magnitude of the distance of the image to the lens.

Your microscope has an objective lens of focal length 1.50 cm and an eyepiece of focal length 2.50 cm separated by 20.0 cm.What is the magnifying power if your near point is 25.0 cm?

How much must the focal length of an eye change when an object,originally at 5.00 m,is brought to 30.0 cm from the eye?

A real object is 42 cm from a negative lens with f = -21 cm.The image is

A spherical mirror exhibits

An object is located 4 cm from a converging lens of focal length 3 cm.The magnitude of the magnification of the image is

An object 25 cm from a convex mirror is observed to produce an image 13.6 cm behind the mirror.What is the focal length of the mirror?

A concave spherical mirror has a radius of curvature of 50 cm.The image of an object located 35 cm in front of the mirror is

A concave (diverging)lens can produce an image that is

To locate the position of an image formed by a lens using ray tracing,one needs to

The eyes of some people wearing glasses appear smaller than normal.The glasses help the people to see

Your left eye can focus on objects a great distance away but cannot focus on objects that are closer than 125 cm to it.The power of the lens in diopters that you need for normal near vision (25 cm)is

Two people look at the same object through the same microscope.Person A has a near point of x_np and person B has a near point of 2x_np.If person A sees the object magnified m times,with what magnification does person B see the object?

When an object is closer to a convex mirror than the mirror's focal point,the

Your farsighted girlfriend requires lenses with a power of 1.67 diopters to read comfortably from a book that is 25.0 cm from her eyes.What is her near point without the lenses?

You construct a microscope with an objective of focal length 1.50 cm and an eyepiece of focal length 2.50 cm.You set the two lenses 20.0 cm apart.What is the overall magnification of your microscope for a person with a normal near point (25.0 cm)?

The focal length of a converging lens that projects the image of a lamp,magnified 4 times,onto a screen 3.05 m from the lamp is approximately