Question

Define refractive index
Write the two laws of reflection
Write the two laws of refraction
Define principal focus
Define Pole, centre of curvature

Answer 1

Explanation:

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Answer 2

Answer:

1. the ratio of the velocity of light in a vacuum to its velocity in a specified medium.
2. Laws of reflection:

• The first law of reflection states that the incident ray, the reflected ray, and the normal to the surface of the mirror, all lie in the same plane.
• The second law of reflection states that the angle of reflection is equal to the angle of incidence. Both angles are measured with respect to the normal to the mirror.

3.In geometrical optics, a focus, also called an image point, is the point where light rays originating from a point on the object converge. Although the focus is conceptually a point, physically the focus has a spatial extent, called the blur circle.