(i) What is meant by:
(A) Spherical aberration?
(B) Chromatic aberration?
(ii) How can spherical aberration be reduced/minimized? Suggest any one method.
Given,
f0 = focal length of the objective = 2 cm
fe = focal length of the eye pieces = 5 cm
Me = Magnification of the eye pieces
Mo = Magnification of the objective
Me = 1 + =
For the objective,
u = -2.4 cm, v = ? and fo = 2 cm
M = magnifying power of the compound microscope.
M = M0 x Me = 5 x 6 = 30, is the required magnification.
(i) Define Resolving Power of a simple astronomical telescope.
(ii) State one advantage of a reflecting telescope over refracting telescope.
ndeviated through a uniform electric field for intensity 5 x 104 Vm-1 and a uniform magnetic field
.
(i) Find the magnitude of magnetic flux density B of the magnetic field.
(ii) What is the direction of is towards right and
is vertically downwards in the plane of this paper?