Exam 34: Geometric Optics

A thin converging lens is found to form an image of a distant building 24 cm from the lens.If an insect is now placed 16 cm from this lens,how far FROM THE INSECT will its image be formed?

A convex spherical mirror with a radius of 50 cm has a 4.0 cm tall object placed 100 cm in front of it.What is the position of the image relative to the mirror?

A man's face is 30 cm in front of a concave spherical shaving mirror.If the image is erect and 1.5 times as large as his face,what is the radius of curvature of the mirror?

An object is placed 100 cm in front of a diverging lens with a focal length of magnitude 25 cm.A converging lens having a focal length of magnitude 33.33 cm is placed 30 cm past the first lens.Where is the final image formed?

An object is placed 10 cm from a convex lens of focal length 20 cm.What is the lateral magnification of the object?

A fisherman in a stream 39 cm deep looks downward into the water and sees a rock on the stream bed.How deep does the stream appear to the fisherman? The index of refraction of the water is 1.33.

The near point of a farsighted person's uncorrected eyes is 80 cm.What power contact lens should be used to move the near point to 25 cm from this person's eyes?

A simple refracting telescope provides large magnification by employing

Which one of the following is a characteristic of a compound microscope?

A double-concave lens has equal radii of curvature of An object placed from the lens forms a virtual image from the lens.What is the index of refraction of the lens material?

A 35-mm camera equipped with a 95 mm focal length lens is used to photograph a tree that is 8.0 m tall.A 32 mm high image of the tree on the film is needed.The required distance,between the tree and the camera lens,to take the photograph is closest to

When an object 1.15 cm tall is placed 12 cm from a lens,the lens produces an upright image of the object that is 5.75 cm tall.What is the focal length of the lens?

It is desired to project the image of an object four times its actual size using a lens of focal length 20 cm.How far from the lens should the object be placed?

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

The angular magnification of a refracting telescope is 40 x.When the object and final image are both at infinity,the distance between the eyepiece and the objective is 143.5 cm.The telescope is used to view a distant radio tower.The real image of the tower,formed by the objective,is 6.0 mm in height.The focal point of the eyepiece is positioned at the real image.What is the angle subtended by the final image of the tower.

In a 35.0-mm single lens reflex camera (SLR),the distance from the lens to the film is varied in order to focus on objects at varying distances.Over what distance range must a lens of 55-mm focal length vary if the camera is to be able to focus on objects ranging in distance from infinity down to 0.60 m from the camera?

An astronomical telescope has an objective of diameter 20 cm with a focal length of 180 cm.The telescope is used with an eyepiece of focal length 30 mm.What is the angular magnification of this telescope?

What power contact lens must be used to correct the vision of a nearsighted person whose far point is 40 cm?

The eyepiece of a compound microscope has a focal length of 2.50 cm and the objective has a focal length of 1.60 cm.The two lenses are separated by 15.0 cm.The microscope is used by a person with normal eyes (near point at 25 cm).What is the angular magnification of the microscope?

A object is 12 cm in front of a concave spherical mirror,and the image is 3.0 cm in front of the mirror.What is the focal length of the mirror?