Question

Explain these terms-:
A) use of spherical lenses
B) Laws of reflection

Answer 1

(A) A spherical lens is a lens whose surface has the shape of the surface of a         sphere. .

(B) Laws of reflection 
1. the incident ray, the reflected ray, and the normal to the surface of the mirror all lie in the same plane.
2. the angle of reflection is equal to the angle of incidence .

Answer 2

A) Sphere shaped mirrors.

B)
* Angle of Incidence is always equal to Angle of reflection.
* The incident ray, the normal to the mirror at the point of reflection all lie on the same plane.