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- What happens to image resolution as the distance between a patient and a parallel hole collimator decreases? a) improves b) worsens C) does not change d) the sameThe primary difference between a TEM and SEM is in a. magnification capability b. colored versus black-and-white images c. preparation of the specimen d. type of lensesContrast how the views differ under high power (40x) and oil immerson (100x) objective lenses in terms of a) magnification b) detail of the cell, c) size of the area being viewed and d) resolution.
- It is desirable that the microscope objectives be parfocal because the specimen will be .................. a)blurry due to the changes in the refractive index of the medium b)stay in focus when the light is turned off c)have more contrast and enhanced details d)remain in focus if the magnification is changed e)none of the answer choicesWhich of the following is/are source/s of error in performing a spectrophotometric method? Answer all that apply. Sample is turbid when the absorbance is read. The absorbances were read at maximum absorption. Standard solutions are prepared accurately. The cuvettes have fingerprints.When trying to focus an object on the microscope, you always begin with the ________________ objective lens and use __________________ adjustment knob to bring the object in focus. Once object is focused, high power objective lens can be used to magnify the object, and only use the ___________________ adjustment knob to focus at this point. a scanning; coarse; fine b low power; coarse; fine c low power; fine; coarse d scanning, fine; coarse
- In X-ray imaging, a film often displays white areas. This is due to: (a) High absorption. (b) Low absorption. (c) High reflection. (d) Low reflection. (e) Low refraction. and why?Which of the following will decrease the limit of resolution (Select all that applies) a) using lower wavelength of illumination b) using an objective lens with lower numerical aperature c) using immersion oil d) using electron as the source of illumination instead of lightA student using a microscope measured the low power field diameter to be 7.1mm. The student then switched from the low power (4x) objective lens to the medium-power (10x) objective lens. Assuming a 10 x ocular (eyepiece) lens, the medium power field diameter is ____ um um is micrometers
- As with standard phase contrast microscopy,differential-interference contrast microscopy depends on differences in the ___________________ of a speciment to create high-contrast images. a. refractive index b. light absorption c. natural fluorescence d. walls and coverings e. natural pigmentationAll other things being equal, the objective lens with the highest value for numerical aperture (N.A.) will always have the lowest______? A. Field Of View B. Magnification C. Image Quality D. Limit Of ResolutionWhich of the following results in green output in spectrophotometry experiment? a. Violet light b. Blue light c. Green light d. Yellow light
