Optics Answers

d) Depict spatial evolution of Fresnel diffraction pattern.

c) Discuss the concept of missing orders with reference to double slit diffraction
pattern.

b) Describe polarisation of light by reflection. How does degree of polarisation vary
with angle of incidence of light?

a) The sodium lamp used in a physics laboratory gives out light uniformly. Suppose
that the lamp uses 40 W. Calculate the magnitude of electric field.

An astronomical telescope is used in normal adjustment when looking at the moon. If the objective has f1=60cm and that of the eye piece is f2=1cm. Suppose the moon has a diameter of 4.50*10^6m and the distance of the moon from the earth is 4.84*10^8m, find the angle of the image of the moon that is subtended by the astronomers eyes.

A concave lens of f=50 is made of material of nr for red lights is 1.640 and nb for
blue light is 1.658.It is then combined with a convex lens of dispersive power
0.0172 to form an achromatic doublet, determination the focal length of the
achromatic lens

An object placed in front of a convex mirror of radius 40cm produces an erect image which is one-sixth the size of the object. How far is the object from the mirror?

The wire PQ has the resistance of 5 ohms and the driver cell has an emf of 2.00 V. What is the value of the resistance R if a balance point is obtained at 0.60 m along PQ when measuring an emf of 6.00mV?

An athlete in the javelin event runs along a horizontal track and launches the javelin at an angle of 40* to the horizontal. The javelin rises to a maximum height and then falls to the ground level. It hits the ground 4.00 s after launching, at a point a horizontal distance of 75.2 m from the launch point.
(i) Show the horizontal component of the launch is 18.8 m/s.
(ii) Calculate the magnitude of the launch velocity.

Calculate the refractive index of the material of an equilateral prism forest the angle of minimum deviation is 60 degree