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Optics
4.
a) Discuss Rayleigh’s criterion for resolving power of an optical instrument. Obtain an
expression for the resolving power of a microscope.
b) A He-Ne laser emits a beam of diameter 2×10−3m and wavelength 630 nm. It is directed
towards an aeroplane flying at a height of 11 km. Calculate the diameter of the light patch
produced on the surface of the aeroplane.
a) Discuss Rayleigh’s criterion for resolving power of an optical instrument. Obtain an
expression for the resolving power of a microscope.
b) A He-Ne laser emits a beam of diameter 2×10−3m and wavelength 630 nm. It is directed
towards an aeroplane flying at a height of 11 km. Calculate the diameter of the light patch
produced on the surface of the aeroplane.
Optics
3. State salient features of single slit Fraunhofer diffraction pattern. The slit is vertical and
illuminated by a point source. Also, obtain an expression for intensity distribution and plot it.
illuminated by a point source. Also, obtain an expression for intensity distribution and plot it.
Optics
2.
a) An oil (μ0 = 1.45) film of thickness 280 nm floats on water (μw = 1.33). It is illuminated
by white light at normal incidence. Which colour in the visible spectrum will be most
strongly (i) reflected, and (ii) transmitted?
b) Obtain the expression for shift in fringes when a thin transparent sheet is introduced in
the path of one of the waves in a double slit interference experiment.
a) An oil (μ0 = 1.45) film of thickness 280 nm floats on water (μw = 1.33). It is illuminated
by white light at normal incidence. Which colour in the visible spectrum will be most
strongly (i) reflected, and (ii) transmitted?
b) Obtain the expression for shift in fringes when a thin transparent sheet is introduced in
the path of one of the waves in a double slit interference experiment.
Optics
a) Discuss Rayleigh’s criterion for resolving power of an optical instrument. Obtain an
expression for the resolving power of a microscope.?
b) A He-Ne laser emits a beam of diameter 2×10^−3m and wavelength 630 nm. It is directed
towards an aeroplane flying at a height of 11 km. Calculate the diameter of the light patch
produced on the surface of the aeroplane.?
expression for the resolving power of a microscope.?
b) A He-Ne laser emits a beam of diameter 2×10^−3m and wavelength 630 nm. It is directed
towards an aeroplane flying at a height of 11 km. Calculate the diameter of the light patch
produced on the surface of the aeroplane.?
Optics
State salient features of single slit Fraunhofer diffraction pattern. The slit is vertical and
illuminated by a point source. Also, obtain an expression for intensity distribution and plot it.
illuminated by a point source. Also, obtain an expression for intensity distribution and plot it.
Optics
Obtain the expression for shift in fringes when a thin transparent sheet is introduced in
the path of one of the waves in a double slit interference experiment.
the path of one of the waves in a double slit interference experiment.
Optics
An oil (μ0 = 1.45) film of thickness 280 nm floats on water (μw = 1.33). It is illuminated
by white light at normal incidence. Which colour in the visible spectrum will be most
strongly (i) reflected, and (ii) transmitted?
by white light at normal incidence. Which colour in the visible spectrum will be most
strongly (i) reflected, and (ii) transmitted?
Optics
Discuss the concept of missing orders with particular reference to double slit diffraction
pattern
pattern
Optics
What is a zone plate? Show that it acts as a multi-foci converging lens.
Optics
Explain the concept of population inversion on the basis of Einstein’s A & B coefficients.
Discuss its significance for developing a LASER.
Discuss its significance for developing a LASER.
