# GENERAL GEOLOGY

## GEOLOGY

### PHYSICAL MINERALOGY

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Light with an angle of incidence greater than a critical angle can be refracted into a low index material (low density).
 A true B false C Either A or B D None of the above
Explanation:

Detailed explanation-1: -If the angle of incidence is greater than the critical angle, light is not refracted at all, when it falls on the surface from a denser medium to a rarer medium.

Detailed explanation-2: -When the angle of incidence of a ray is greater than the critical angle, the refracted ray is in the same medium, i.e., the light is totally reflected in the same medium.

Detailed explanation-3: -Total internal reflection Partial reflection occurs when angle of incidence is less than critical angle whereas total internal reflection occurs when angle of incidence is greater than critical angle.

Detailed explanation-4: -The relation between incidence and refracted angle depends upon the refractive index of the medium. If a light ray passes from denser medium to rarer medium, the refracted angle is greater than incidence angle and vice versa.

Detailed explanation-5: -If the angle of incidence is greater than the critical angle, the ray will be reflected back to the same medium without undergoing refraction. This is known as total internal reflection.

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