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Exam 33: Lenses and Optical Instruments

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Question 41

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What type of lens is a magnifying glass?

A) converging
B) diverging
C) spherical
D) cylindrical
E) achromatic

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Question 42

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A convex lens always produces a virtual image.

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Question 43

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Consider the image formed by a refracting telescope. Suppose an opaque screen is placed in front of the lower half of the objective lens. What effect will this have?

The image of the rare stamp you see through a magnifying glass is

A lens is made with focal length -40 cm using a material with index of refraction 1.50. A second lens is made with the same geometry as the first but using a higher index material, the index being 2.00. What is the focal length of the second lens?

The length of the telescope is 1.60 m and it has a magnification of 60.0. What is the focal length of the objective?

Jill is farsighted and cannot see objects clearly that are closer to the eye than 80.0 cm. What is the refractive power of the contact lenses that will enable her to see objects at a distance of 25.0 cm from her eyes?

Chromatic aberration can be corrected by combining two or more lenses to form a compound lens.

Spherical lenses suffer from

A person uses a converging lens of focal length 5.0 cm as a magnifying glass. (a) What is the magnification if the person's eye is relaxed? (b) What is the maximum possible magnification?

An object is placed on an optical bench. A lens with a focal length of 12 cm is placed 20 cm from the object. Where should a second lens, with a focal length of 4.0 cm, be placed if a total magnification +6 is to be obtained?

A camera lens has a focal length of 50.0 mm and an aperture setting of 4.00. What is the aperture diameter of this lens?

The deviation of a lens from its ideal behavior is referred to as

What power contact lens should be used to correct the vision of a farsighted person whose near point is 80 cm to see something clearly at a distance of 25 cm?

The focal lengths of the objective and the eyepiece of a microscope are 0.5 cm and 2.0 cm, respectively, and their separation adjusted for minimum eyestrain is 6.0 cm. The near-point distance of the person using the microscope is 25.0 cm. (a) If the microscope is focused on a small object, what is the distance between the object and the objective lens? (b) If the microscope is focused on a small object, what is its final magnification?

The principal refraction of light by the eye occurs at the

A light ray, traveling parallel to the axis of a convex thin lens, strikes the lens near its midpoint. After traveling through the lens, this ray emerges traveling obliquely to the axis of the lens

What is the magnification of a magnifying glass of focal length 4.0 cm if the image is to be viewed by a relaxed eye with a near point of 25 cm?

The focal lengths of the objective and eyepiece in a compound microscope are 0.8 cm and 2.5 cm, respectively. The image formed by the objective is 16 cm from it and the final image is 25 cm from the eye. What is the total magnification?

A doubly convex thin lens is made of glass with an index of refraction of 1.52. The radii of curvature of the faces of the lens are 60 cm and 72 cm. What is the focal length of the lens?