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SEMMELWEIS UNIVERSITY Medical Biophysics I. Semifinal - Practice topics || with 100% Error-free Answers.
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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 answ...

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  • December 15, 2024
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SEMMELWEIS UNIVERSITY Medical Biophysics I.
Semifinal - Practice topics || with 100% Error-free Answers.
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.

How do you determine concentration by absorption photometry? correct answers Beer lamberts
law: valid for dilute solutions log(Jo/J)=ext.coeff*c*xExt.coeff. depends on the type of material
and the wavelength.

Define optical density (absorbance). correct answers =log(Jo/J)

Define transmittance. correct answers T=J/Jo (*100%)

How much light is transmitted by a sample with an absorbance of 1? correct answers 10%

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