Exam 12: Optical Images

An object is placed 200 cm from a screen. When a converging lens is placed between the object and screen at a distance of 160 cm from the object, an image is formed on the screen. Without moving the object or screen, an image can also be formed on the screen when the distance from the object to the lens is

Which of the following statements about the figure is correct when the index of refraction n₂ is greater than n₁?

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?

A person uses two microscopes to view the same object. Microscope A is twice as long as microscope B and contains lenses with focal lengths that are one-half those of B. If microscope A provides a magnification of m, then what magnification does B provide?

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

Two parallel rays are incident on a concave spherical mirror whose center of curvature is at 3. After being reflected, the two rays cross at point

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.

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

A two lens magnifying system uses lenses of focal lengths 2.5 and 9.5 cm for the objective and eyepiece respectively. The two lenses are positioned 23 cm apart. An object for study is placed 3.0 cm in front of the objective lens. Find the position of the final image relative to the eyepiece lens.

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

Your microscope has an objective lens of focal length 1.20 cm and an eyepiece of focal length 2.40 cm separated by 16.0 cm. What is the magnifying power if your near point is 25.0 cm?

A person uses a simple magnifying glass to study faces on an old school photograph. If the person has a near point of 25 cm and the magnifying glass (which is held close to the eye) has a focal length of 6 cm, then calculate the distance the photograph must be held in front of the magnifying glass.

When an object is farther from a concave mirror than twice the mirror's focal length, the

The image produced by the converging lens is at point

The resolving power of a telescope is a measure of the ability of the instrument to

After passing through the thin converging lens, the two rays cross at point

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 magnification of the image and whether it is upright or inverted.

When a human eye that has a power of +60 D is fitted with a contact lens of -10 D, the equivalent lens combination is

A simple magnifier gives a magnification of 8 times when it is used by a person with a normal near point (25 cm). What is the magnifying power when it is used by a person whose near point is 15 cm?

Your nearsighted instructor cannot focus clearly on objects more distant than 150 cm from her eyes. What power lenses are required for her to see distant students clearly?