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Chapter 26: Q17CQ (page 955)

What advantages do oil immersion objectives offer?

Short Answer

Expert verified

The oil immersion objective increases the refractive index of the, and hence we can achieve more NA and therefore a greater resolution.

Step by step solution

01

Definition of refractive index

Refractive Index is a value calculated from the ratio of the speed of light in a vacuum to that in a second medium of greater optical density.

02

Advantages of oil immersion

The numerical aperture (NA) is given by Nsinα. Now with the oil immersion objective, the refractive index of the medium becomes higher, and hence we can achieve more NA and therefore a greater resolution.

Also, the oil in the oil immersion objective is used to match the refractive index of the cover glass and the refractive index of the cover glass, and the refractive index of the objective lens. This reduces the loss of light due to reflection from the interfaces.

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Most popular questions from this chapter

A 7.5×binocular produces an angular magnification of-7.50 , acting like a telescope. (Mirrors are used to make the image upright.) If the binoculars have objective lenses with a 75.0cm focal length, what is the focal length of the eyepiece lenses?

Unless otherwise stated, the lens-to-retina distance is 2.00 cm.

(a) The print in many books averages 3.50 mmin height. How high is the image of the print on the retina when the book is held 30.0 cmfrom the eye?

(b) Compare the size of the print to the sizes of rods and cones in the fovea and discuss the possible details observable in the letters. (The eye-brain system can perform better because of interconnections and higher order image processing.)

A cataract is a cloudiness in the lens of the eye. Is light dispersed or diffused by it?

List the various types of aberrations. What causes them and how can each be reduced?

A large reflecting telescope has an objective mirror with a 10.0m radius of curvature. What angular magnification does it produce when a 3.00m focal length eyepiece is used?
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