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Optics
Differentiate between trichromatic and opponent colour theories of colour vision.
Optics
Explain the term birefringence. Explain how is unpolarised light incident on a uniaxial crystal polarised ? Draw o-and e-wave surfaces in a negative uniaxial crystal.
Optics
In Newton's ring experiment the radius of curvature of the 'lens is 0.7 m and the diameter of the 10th bright ring formed due to reflected light is 0.5 cm. Calculate the wavelength of light used.
Optics
Explain the term population inversion. Why
is it necessary to have population inversion
for operation of a laser ? Draw a line diagram
showing three level pumping scheme.
is it necessary to have population inversion
for operation of a laser ? Draw a line diagram
showing three level pumping scheme.
Optics
What do you understand by resolving power of a microscope ? Show that for a microscope, the smaller the numerical aperture (N.A) the greater will be the resolving power.
Optics
You set up a single slit diffraction experiment in air that produces a diffraction pattern on a screen where the central maximum has a width of 5.3 mm.
You immerse the whole experiment in a fluid of refractive index n = 1.38.
What is the width of the central maximum now that you have immersed the experiment in the fluid? (to 2 s.f and in mm)
You immerse the whole experiment in a fluid of refractive index n = 1.38.
What is the width of the central maximum now that you have immersed the experiment in the fluid? (to 2 s.f and in mm)
Optics
a plane mirror is placed at a distance 12.5 cm from the focus of a concave mirror of radius curvature 20cm find where the object can be placed between the two Mirrors of the first image in the both of the Mirrors concide
Optics
The focal length of a diverging lens is negative. If f = −13 cm for a particular diverging lens, where will the image be formed of an object located 42 cm to the left of the lens on the optical axis?
cm to the left of the lens
What is the magnification of the image?
cm to the left of the lens
What is the magnification of the image?
Optics
A shock absorber acts like an elastic spring of constant k. It compresses by 2.5 cm when a mass m is placed on it. When the absorber-mass system is pressed and left, it begins to oscillate. Calculate the frequency of oscillations. Take g : 10 ms^-2
Optics
An object and screen are 80cm apart. There are two positions at which a convex lens forms real image on the screen the magnification in two cases are 3/2 and 2/3 . calculate the focal length of the lens
