Explain the construction and working of an Telephone.

Explain the construction and working of a dry cell.

Explain the construction and working of transformer.

Explain the construction and working od kaleidoscope.

Explain the construction and working of a 'Compound Microscope'.

(a) (i) Explain the construction and working of a 'Compound Microscope' with a neat diagram. (ii) State Snell's Law.