Physics of Light: Reflection and Refraction

The video tutorial covers the laws of reflection and refraction, explaining how light behaves when it encounters different materials. It introduces the concept of the normal line and the angles of incidence and reflection, stating that they are equal. The tutorial also explains refraction, where light bends as it passes through materials with different refractive indices, and introduces Snell's Law for calculating refraction angles. The video further discusses how the speed and wavelength of light change in different materials and provides example problems to illustrate these concepts.

What is the angle of reflection if the angle of incidence is 45°?

• 30°

• 60°

• 45°

• 90°

Which law helps in calculating the angle of refraction when light passes through different media?

• Newton's Law

• Snell's Law

• Ohm's Law

• Hooke's Law

What happens to the speed of light when it enters a medium with a higher index of refraction?

• It decreases

• It increases

• It becomes zero

• It remains the same

How does the wavelength of light change when it moves from air to glass?

• It increases

• It decreases

• It remains the same

• It doubles

What type of reflection occurs on a smooth surface like a mirror?

• Scattered reflection

• Random reflection

• Diffuse reflection

• Specular reflection

In a practice problem, if light strikes a mirror at a 30° angle, what is the angle of reflection?

• 30°

• 60°

• 90°

• 120°

If the index of refraction for glass is 1.5, what is the wavelength of light in glass if its wavelength in a vacuum is 600 nm?

• 300 nm

• 400 nm

• 900 nm

• 600 nm

What is the index of refraction of a material if the speed of light in it is 2.0 x 10^8 m/s?

• 1.0

• 1.5

• 1.25

• 1.33

Which of the following is true about the frequency of light as it moves from air to glass?

• It increases

• It becomes zero

• It decreases

• It remains constant

What is the angle of refraction when light enters a diamond from air at a 45° angle?

• 35°

• 30°

• 25°

• 15°