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Front

What is the principle that explains why light travels in a straight line?

Back

Light travels in a straight line when there is nothing to interfere with its waves.

Front

What is the phenomenon called when light bounces off a surface?

Back

Reflection.

Front

What is the phenomenon called when light changes direction as it passes from one medium to another?

Back

Refraction.

Front

What causes the lower part of an object to appear different in size when viewed through water?

Back

The refraction of light rays as they travel from water to air.

Front

What happens to a light ray when it strikes a reflective surface?

Back

It is reflected.

Front

What is the law that describes the angle of incidence and the angle of reflection?

Back

The law of reflection states that the angle of incidence is equal to the angle of reflection.

Front

What is the index of refraction?

Back

The index of refraction is a measure of how much light slows down in a medium compared to its speed in a vacuum.

Front

How does the speed of light change when it enters a denser medium?

Back

The speed of light decreases when it enters a denser medium.

Front

What is total internal reflection?

Back

Total internal reflection occurs when light hits a boundary at an angle greater than the critical angle, causing it to reflect entirely back into the medium.

Front

What is the critical angle in optics?

Back

The critical angle is the angle of incidence above which total internal reflection occurs.