Question

A person needs a lens of power + 3D for correcting his near vision
and 3D for correcting his distant vision. Calculate the focal lengths
of the lenses required to correct these defects.
24. Give reasons for the following:
There is either a convergence or a divergence of magnetic field lines
near the ends of a current carrying straight solenoid.
The current carrying solenoid when suspended freely rests along a
particular direction.
(iii) The burnt out fuse should be replaced by another fuse of identical
rating.
Section - C
Write balanced chemical equations to explain what happens, when
(1) Mercuric oxide is heated.
(ii) Mixture of cuprous oxide and cuprous sulnhide is heated​

Answer 1

A person needs a lens of power + 3D for correcting his near vision

and 3D for correcting his distant vision. Calculate the focal lengths

of the lenses required to correct these defects.

focal length of one lens is 0.333m  

focal length of another lens is -0.333m