Exam 23: Mirrors and Lenses

Two thin lenses with focal lengths 23.0 cm and 33.0 cm are placed in contact in an orientation so that their optic axes coincide.What is the focal length of the two in combination? (Hint: A thin lens is one whose thickness is negligible).

Reducing the lens aperture size is a scheme one can use to reduce the occurrence of which of the following effects?

A concave mirror forms a real image at 29.0 cm from the mirror surface along the principal axis.If the corresponding object is at a 10.0-cm distance,what is the mirror's focal length?

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

A 80-cm focal length thin lens is placed in contact with one of 59.2 cm focal length.An object is placed 51 cm in front of the combination.What is the image distance?

A container is filled with fluid 1,and the apparent depth of the fluid is 8.00 cm.The container is next filled with fluid 2,and the apparent depth of this fluid is 6.00 cm.If the index of refraction of the first fluid is 1.30,what is the index of refraction of the second fluid?

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?

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 convex mirror with focal length of -26 cm forms an image 15 cm behind the surface.Where is the object located as measured from the surface?

A projector lens is needed to form an image on a screen 10 times the size of its corresponding object.The screen is located 6.0 m from the lens.What is the required focal length of the lens?

If a virtual image is formed along the principal axis 9 cm from a concave mirror with the focal length 16 cm,what is the object 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 true?

What is the image distance of an object 1.30 m in front of a converging lens of focal length 20.0 cm?

A concave mirror with focal length 17.0 cm is placed 38.0 cm to the left of the object.A convex lens of focal length 18.0 cm is placed 54.0 cm to the right of the object.Where is the image formed by both the mirror and the lens?

A 2.5 cm tall object is placed along the principal axis of a thin convex lens of 16 cm focal length.If the object distance is 29 cm,which of the following best describes the image distance and height,respectively?

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?

When the reflection of an object is seen in a plane mirror,the image is:

An object 6 cm high is placed 18 cm in front of a mirror.What type of mirror and what radius of curvature is needed for an image that is upright and 16 cm tall?

An object is held at a distance of 23 cm from a convex mirror creating an image that is 1/4 the object size.What is the focal length of the mirror?

If atmospheric refraction did not occur,how would the apparent time of sunrise and sunset be changed?