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SEMMELWEIS UNIVERSITY Medical Biophysics I. Semifinal - Practice topics Exam Questions and Answers
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SEMMELWEIS UNIVERSITY Medical Biophysics I. Semifinal - Practice topics Exam
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SEMMELWEIS UNIVERSITY MedicalBiophysics I. Semifinal - Practice topics
Exam
How does refractive power of a lens change if its radius of curvature decreases? -
Correct Answers -The power increases
How does refractive power of a lens change if its radius of curvature increases? -
Correct Answers -The power decreases
What is radius of curvature in case of a lens? - Correct Answers -Flattener lens= larger
radius of curvature. More rounded
lens=lesser radius of curvature.
How does refractive power of a lens change if its index of refraction increases? -
Correct Answers -Refractive power will increase
Calculate the refractive power of a lens with a focal distance of 25 cm. - Correct
Answers -1/0.25=4 dpt
Calculate the refractive power of a lens with a focal distance of 20 cm. - Correct
Answers -1/0.20=5 dpt
Calculate the refractive power of a lens with a focal distance of 17 mm. - Correct
Answers -1/0.017=5.88 dpt
Characterize the image of an object placed within the focal distance of a converging
lens. - Correct Answers -Virtual, magnified and upright
Characterize the image of an object placed between the single and the double focal
distance of a converging lens. - Correct Answers -Real, magnified and inverted
Characterize the image of an object placed outside the double focal distance of a
converging lens. - Correct Answers -Real, diminished and inverted
, What kind of image is formed by a compound light microscope? - Correct Answers -
Virtual, magnified and inverted
What is the total magnification of a light microscope if the objective magnification is
100x and the ocular magnification is 20x? - Correct Answers -100*20= 2000
Describe the steps of the eyepiece scale calibration process. - Correct Answers -
1.eyepiece scale is placed in the intermediate image plane (unknown units)2.place a
stage micrometer (with known units) as a ''specimen'' 3.focus the eyepiece scale and
the micrometer on one another 4.calculate the calibration factor by dividing the known
length of the stage micrometer by the number of rules of the eyepiece scale.
What prisms are present in the Abbe-refractometer? - Correct Answers -Illuminating
prism (rough surface), measuring prism (flint glass with high index of refraction) and
Amici prisms (restores dispersed light to white light or vise versa)
What sample can be measured with the Abbe-refractometer? - Correct Answers -
Solutions with an index of refraction lower than that of the
measuring prism (because we want snell's window)
What is the role of Amici prism? - Correct Answers -To restore dispersed light into white
light (or vice versa)
What is optical dispersion? - Correct Answers -Phenomenon in which white light is
decomposed into component
colors due to the dependence of refractive index on frequency
Factors influencing the value of index of refraction. - Correct Answers -Solvent
concentration in dilute solution, the frequency, temperature
(makes fluids less viscous so light travels faster)
Formation of Snell circle. - Correct Answers -Grazing rays from lower index of refraction
medium, refract at the boundary and make critical angles at the medium with the higher
index of refraction, the critical angles form the borders of a cone of bright light.
How do you determine concentration by refractometry? - Correct Answers -In case of
dilute solutions n1=n0+k*c
What is the refractive index of distilled water? - Correct Answers -1.33
Definition of absorption spectrum. - Correct Answers -Absorbance as a function of
wavelength. Unique to every element.
What information can you obtain from an absorption spectrum? - Correct Answers -
Concentration of solutions (based on intensity change) and the
electronic structure of the atom.
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