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Exam 23: Mirrors and Lenses

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Question 1

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Which of the following best describes the image of a concave mirror when the object's distance from the mirror is less than the focal point distance?

A) virtual,upright and magnification greater than one
B) real,inverted and magnification less than one
C) virtual,upright and magnification less than one
D) real,inverted and magnification greater than one

E) A) and C)
F) A) and B)

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Question 2

Multiple Choice

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A woman looking in a makeup mirror sees her face at twice its actual size and right-side up.If she is 28.0 cm from the mirror,what is its focal length?

A) 18.6 cm
B) 44.0 cm
C) 48.3 cm
D) 56.0 cm

E) None of the above
F) A) and B)

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Question 3

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Which of the following best describes the image from a plane mirror?

An object and a screen are separated by 20.00 cm.A convex lens is placed between them,5.00 cm from the object.In this position it causes a sharp image of the object to form on the screen.What is the focal length of the lens?

An object is 12.0 cm from the surface of a spherical Christmas tree ornament that is 8.00 cm in diameter.What is the magnification of the image?

An object is placed 25 cm to the left of a lens of focal length 20 cm.75 cm to the right of this lens is a plane mirror.Where does the final image form?

A solid glass sphere with a radius of 5.00 cm and index of refraction of 1.52 has a small coin embedded 3.00 cm from the front surface of the sphere.For the viewer looking at the coin through the glass,at what distance from the front surface of the glass does the coin's image appear to be located?

A concave mirror with focal length 24.0 cm is placed 40.0 cm to the left of the object.A convex lens of focal length 12.0 cm is placed 40.0 cm to the right of the object.Where is the image formed by both the mirror and the lens?

You stand two feet away from a plane mirror.How far is it from you to your image?

Which best describes the image of a concave mirror when the object is located somewhere between the focal point and twice the focal point distance from the mirror?

An object is placed 10 cm in front of a mirror,and an image is formed that has a magnification of 2.Which of the following statements is false?

A fused combination of a diverging and converging lens pair each made from a different index of refraction glass,is used to reduce the occurrence of which of the following effects?

Use of a parabolic mirror,instead of one made of a circular arc surface,can be used to reduce the occurrence of which of the following effects?

A lens of 12.0-cm focal length is placed 20 cm to the right of the object and a mirror of focal length -20.0 cm is placed 50.0 cm to the right of the lens.Where is the image formed by the mirror?

An object of length 3.00 cm is inside a plastic block with index of refraction 1.40.If the object is viewed from directly above,what is the length of its image?

Which of the following effects is the result of the fact that the index of refraction of glass will vary with wavelength?

An image is formed using a convex lens,the image being 15 cm past the lens.A second lens is placed 25 cm past the first lens and another image is formed,this time 10 cm past the second lens.Which of the following statements is always true?

In an ideal case rays coming from an object toward a lens or mirror should be reasonably close to the optic axis.To the extent that this condition is not completely met,which one of the following effects occurs?

A thin lens has a focal length of 10.00 cm for red light.If the index of refraction for the lens material tends to decrease with increasing wavelength,what is the focal length of the lens for blue light?

Which of the following best describes the image for a thin convex lens that forms whenever the object is at a distance less than one focal length from the lens?