Exam 34: Geometric Optics

What is the angular magnification of a magnifying glass of focal length 4.0 cm if the image is to be viewed by a relaxed eye (image at the far point)having a near point of 25 cm and a far point at infinity?

The distance between the object and the eyepiece of a compound microscope is 25.0 cm.The focal length of its objective lens is 0.200 cm and the eyepiece has a focal length of 2.60 cm.A person with a near point of 25.0 cm and a far point at infinity is using the microscope. (a)What is the angular magnification obtainable using the eyepiece alone as a magnifying lens if the final image is at the person's far point? (b)What is the total magnification of the microscope when used by the person of normal eyesight?

What is the focal length of a magnifying glass that produces an angular magnification of 7.0 x when used by a person with a near point at 28 cm?

As you walk away from a vertical plane mirror,your image in the mirror

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 focal length of the objective lens?

In the figure,the radius of curvature of the curved part of the lens is 35.0 cm,and the refractive index of the lens material is 1.620.What is the focal length of the lens?

A swimming pool is filled to a depth of 2.0 m.How deep does the pool appear to be from above the water,which has an index of refraction of 1.33?

A machinist with normal vision has a near point at 25 cm.The machinist wears eyeglasses in order to do close work.The power of the lenses is +1.75 diopters.With these eyeglasses,what is the near point of the machinist?

The focal lengths of the objective and the eyepiece in a microscope are 0.29 cm and 2.50 cm,respectively.An object is placed at 0.30 cm from the objective lens and the image of this object is viewed with the eyepiece adjusted for minimum eyestrain (with the eye focused at the far point).The near point of the person using the microscope is 25 cm and the far point is at infinity.What is the final overall magnification of the microscope?

What is the uncorrected near point of a person who has a near point that is 25 cm from his eyes when he is wearing 3.33-diopter contact lenses?

The focal lengths of the objective and the eyepiece in a microscope are 0.290 cm and 2.50 cm,respectively.An object is placed 0.300 cm from the objective.The image of this object is viewed with the eyepiece adjusted for minimum eyestrain (image at the far point of the eye)for a person with normal vision.What is the distance between the objective and the eyepiece?

A concave spherical mirror with a radius of 20 cm creates a real image 30 cm from the mirror.How far is the object from the mirror?

An object 1.25 cm tall is placed 100 cm in front of a convex lens with a focal length of magnitude 50 cm.A concave lens with a focal length of magnitude 20 cm is placed 90 cm beyond the first lens.Where is the final image located?

In the figure,the image is viewed on a screen and is 13.5 mm tall.What is the focal length of the lens?

A magnifying lens has a focal length of 10 cm.A person has a near point of 25 cm and a far point at infinity.What is the angular magnification of the lens for that person when their eyes are focused at infinity?

A thin double convex lens is to focus the image of an object onto a screen so that the image is life-sized.The lens surfaces have equal radii of curvature of 112 cm,and the refractive index of the lens material is 1.500. (a)How far from the lens should the screen be placed? (b)How far is the screen from the object?

A man is nearsighted and cannot see things clearly beyond 110from his eyes.What is the focal length of the contact lenses that will enable him to see very distant objects clearly?

A magnifying glass uses a converging lens with a refractive power of 20 diopters.What is the magnification if the image is to be viewed by a relaxed eye (image at the far point)having a near point of 25 cm and a far point at infinity?

A person can read the newspaper when it is held at 60 cm from his eyes.What should the focal length of his contact lenses be to allow him to read the newspaper comfortably at a distance of 30 cm?

A singer is farsighted and cannot see objects clearly that are closer than 80.0 cm from his unaided eye.What is the refractive power of the contact lenses that will move his near point to a distance of 25.0 cm from his eye?