Exam 33: Lenses and Optical Instruments

What is the focal length of a magnifying glass if a 1-mm object appears to be 10 mm?

For a converging lens,when is the object distance equal to the image distance?

A student finds a 12-cm long metal tube with a lens attached to one end.The attached lens has a focal length of 0.60 cm.The student wants to use the tube and lens to make a microscope with a magnification of 100x.What focal length lens should the student attach to the other end of the tube?

A converging lens always has a

A person with a near-point distance of 28.0 cm finds that a magnifying glass gives an angular magnification that is 1.50 times larger when the image of the magnifier is at the near point than when the image is at infinity.What is the focal length of the magnifying glass?

An object is 6.0 cm from a thin lens along the axis of the lens.If the lens has a focal length of 9.0 cm,determine the image distance.

An object is 6.0 cm from a thin lens along the axis of the lens.If the lens has a focal length of 9.0 cm,determine the image magnification.

Consider a small light bulb,3 m to the left of a biconvex lens,which forms an image 2 m to the right of the lens.The lens is made of glass with index of refraction 1.4 and its two surfaces have equal radii of curvature.How large is the radius of curvature?

Which ray passing through a diverging lens is not properly drawn?

The focal length of your Nikon camera lens is 70 mm.It is used for taking pictures of your friend who is 1.5 m tall.What is your friend's distance from the lens if the image just fills the 24-mm vertical dimension of the film?

Suppose your friend wears prescription glasses of power +2.5 D. Where is her near point?

The lens of a camera is moved 0.46 mm to change focus from a person 50.0 m away to one that is 5.0 m away.What is the focal length of the lens of a camera?

An object 2.0 cm high is projected onto a screen using a converging lens with a focal length of 35 cm.The image on the screen is 34 cm high.What is the distance of the lens from the screen?

Using ray tracing,find the image of the object (upright arrow)in the system shown having a diverging lens where f is a focal point.Which one of the statements is true?

An object is placed 2 cm from a converging lens with a focal length of 5.4 cm.Which of the following correctly describes the image?

A diverging lens is fabricated from a piece of glass with an index of refraction of 1.5.It is ground such that one surface of the lens is convex and the other surface is concave.The convex surface is part of a sphere with a radius of 45 cm and the concave surface is part of a sphere with a radius of 20 cm.What is the focal length of this lens?

The typical length of a human eyeball is 1.7 cm.What is the effective focal length of the two lens system made from a normal person's cornea and lens when viewing objects very far away?

A system of two converging lenses is used to examine a leaf from a distance (to the first lens)of 25cm.If the focal lengths of the two lenses are 12 cm and 17 cm,respectively,and the overall magnification is -0.481,then what distance is there between the two lenses?

A diverging lens always has a

The object which has a height of 2.5 cm is placed 5.0 cm away from a converging (convex)lens with a focal length of 3.0 cm.What can be said about the image?