A- plane mirror because its surface is plane
Answer:

Explanation:
Given,
Magnetic field, B = 5 x 10⁻⁵ T
Number of turns, N = 450
length = 29 cm
Current,I = ?
Using formula of magnetic field due to solenoid




Hence, the current obtained is equal to 0.0256 A.
Explanation:
If the size and direction of the forces on the object are exactly balanced , then there is no net force acting on the object
It slowly cools an hardens,eventually turning into igneous rock<span />
Military personnel also use periscopes in some gun turrets and in armoured vehicles. More complex periscopes using prisms or advanced fibre optics instead of mirrors and providing magnification operate on submarines and in various fields of science