Daniel Vlk
Department of Biophysics
17 - Exercises
* Calculate linear magnification of a lens, if you know that object height is
2mm and image height is 1m.
A microscope objective has focal distance f1=1cm and eyepiece f2=3cm,
optical interval of the microscope is d=2cm. Object height is y=50mm
and object distance is a=15mm in front of the objective. Calculate the
image position, height and linear magnification of the microscope.
A microscope eyepiece has focal distance f=10mm, distance between
objective lens and eyepiece lens is d=20cm. Final image height is
y=100mm and distance is a=15mm in front of the eyepiece. Calculate
the object position, height and focal distance of the eyepiece if the linear
magnification of the microscope is 100.
Which lenses needs an human eye if the near point is 10cm.
Which lenses needs an human eye if the far point is 120 cm.
Which glasses needs a hyperopic eye if the near point is 100cm.
Which glasses needs a myopic eye if the far point is 100cm.
The Human retina is sensitive to a yellow light with power
P = 1,7.10-18 W. How many photons of the yellow light fall on retina per
second.
The Human retina needs for a stimulation by the red light minimum power
P = 2,5.10-17 W. How many photons of the red light must fall on retina per
second.
150 photons per second do a stimulation of a human retina, with power
P = 5.10-16 W. Calculate wavelength of the light.