Exam 27: Optical Instruments

A nearsighted person cannot see objects beyond 80 cm from his eyes. Which one of the following combinations represents the correct focal length and the refractive power of the contact lenses that will enable him to see the distant objects clearly?

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. What is the total magnification of the microscope when used by the person of normal eyesight?

A magnifying glass produces an angular magnification of 7. What is the focal length of this lens if a person whose near point is 28 cm reads a book using this magnifying glass?

The length of the telescope is 1.60 m and it has a magnification of 60.0. What is the focal length of the objective?

A magnifying glass produces a virtual image.

The chromatic aberration in lenses is due to the

Do mirrors suffer from chromatic aberration?

In a compound microscope the final image is virtual.

A simple compound microscope provides large magnification by employing

What is the resolution limit at 400. nm, due to diffraction, of the Hubble Space Telescope which has an aperture of 2.4 meters?

Spherical lenses suffer from

The back of a person's eye is too close to the lens. This person is suffering from

The focal length of the objective in a microscope is very small as compared to the focal length of the eyepiece.

What is the power of a lens that has a focal length of -40 cm?

The distance between the object and the eyepiece of a compound microscope is 18.0 cm. The focal length of its objective lens is 0.80 cm and the eyepiece has a focal length of 2.3 cm. The near-point distance of the person using the microscope is 25.0 cm. What is the total magnification of the microscope?

The difference between a camera and the human eye is that a camera utilizes a fixed focal length lens and the eye does not.

A nearsighted person has a near point of 12. cm and a far point of 17. cm. If the lens is 2.0 cm from the eye: (a) what lens power will enable this person to see distant objects clearly? (b) what then will be the new near point?

The length of time the shutter is open when the film is exposed in a camera is determined by the

Nearsightedness can be corrected with a diverging lens.

A person is nearsighted with a near point of 75. cm. (a) What FOCAL LENGTH is this? (b) What POWER lens is needed to correct their nearsightedness (assuming distance from lens to eye is negligible)?