Question

what to learn in reflection and refraction of light!!???

for boards !!
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Answer 1

Answer:

Light rays change direction when they reflect off a surface, move from one transparent medium into another, or travel through a medium whose composition is continuously changing. The law of reflection states that, on reflection from a smooth surface, the angle of the reflected ray is equal to the angle of the incident ray. (By convention, all angles in geometrical optics are measured with respect to the normal to the surface—that is, to a line perpendicular to the surface.) The reflected ray is always in the plane defined by the incident ray and the normal to the surface. The law of reflection can be used to understand the images produced by plane and curved mirrors. Unlike mirrors, most natural surfaces are rough on the scale of the wavelength of light, and, as a consequence, parallel incident light rays are reflected in many different directions, or diffusely. Diffuse reflection is responsible for the ability to see most illuminated surfaces from any position—rays reach the eyes after reflecting off every portion of the surface.

Hope its help

Answer 2

Answer:

The following are the most important topics from light - reflection and refraction:

• What is refraction? state laws of refraction.

• Numerical problems regarding magnification, lens formula , mirror formula and some problems from the calculation of refractive index.

• Ray diagrams could be asked alongside numerical problems.

• Mention the Types of spherical mirrors and explain briefly.

• Where on placing object would you get an erect image to be obtained in concave mirror? (1-MARK)

• Define Centre of curvature , focal length , and pole of a mirror.

• What is snell's law?

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