What is meant by :
(1) Spherical aberration ?
(2) Chromatic aberration ?
(ü) How can spherical aberration be reduced/ minimized ? Suggest any one method.

How can the spherical aberration produced by a lens be minimised ?

Can mirrors give rise to chromatic aberration ?

What is chromatic aberration? How can it be minimized or eliminated ?

Spherical aberration in a thin lens can be reduced by

How can we help in reducing the problem of waste disposal? Suggest any three methods.

What is the cause of spherical aberration in lenses? State a method to minimise the defect.

How can you help in reducing the problem of waste disposal? Give any two methods

What are four different types of energy losses in a transformer? State how to reduce/minimize any one of them.

What is meant by coagulation of a colloidal solution? Name any method by which coagulation of lyophobic sols can be carried out.

(a) In young.s double slit experiment, using monochromatic light, fringes are obtained on a screen placed at some distance from the slits. If the screen is move by 5xx10^(-2) m towards the slits, the change in the fringe width is 3xx10^(-5) m. If the distance between the two slits is 10^(-3) m, calculate wavelength of the light used. (b) What is meant by .Chromatic aberration. ? A thin convex lens of focal length 30 cm and made of flint glass (dispersive power= 0.03 ) is kept in contact with a thin cancave lens of focal length 20 cm and made of crown glass. Calculate the dispersive power of crown glass if the above said combination acts as an achromatic doublet.