Optics Answers

In young's double slit arrangement, a thin
transparent sheet of thickness t and
refractive index u is introduced in the path of
one of the beams. Obtain the expression for
the distance through which each of the
maxima gets shifted.

e.m.waves are incident normally on an
interface separating two media of refractive
indices n1 and n2. Obtain expressions for
reflection and transmission coefficients.

Discuss the terms accommodation and
convergence in the context of image formed by
human eye.

Differentiate between trichromatic and opponent colour theories of colour vision.

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.

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.

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.

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.

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)

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