Question 1

Which statement best describes the difference between specular and diffuse reflection?

Accepted Answer

Specular reflection occurs on smooth surfaces and keeps light in a single direction, while diffuse reflection occurs on rough surfaces and scatters light in many directions.

Question 2

A ray of light strikes a flat mirror at an angle of $$25^	ext{o} to $$the normal. What is the angle between the incident and reflected rays?

Accepted Answer

$$50^	ext{o}$$

Question 3

Which equation correctly represents the law of reflection?

Accepted Answer

$$	heta_r = 	heta_i$$

Question 4

What happens to the wave fronts of a spherical wave as they move farther from their source?

Accepted Answer

They become increasingly flat and resemble planar wave fronts.

Question 5

A pencil appears bent when placed in water. Which physical principle explains this observation?

Accepted Answer

Refraction

Question 6

Which formula defines the index of refraction $$n$$ for a medium?

Accepted Answer

$$n = \frac{c}{v}$$

Question 7

Snell's Law relates the angles of incidence and refraction to the indices of refraction of two media. Which is the correct form of Snell's Law?

Accepted Answer

$$n_1$$ \sin \$$theta_1$$ = $$n_2$$ \sin \$$theta_2$$

Question 8

In a plane mirror, where is the image of an object located?

Accepted Answer

At the same distance behind the mirror as the object is in front of it.

Question 9

A marching band moves from solid ground to muddy ground. What physics concept does this scenario illustrate?

Accepted Answer

Refraction

Question 10

Which statement about the image formed by a plane mirror is correct?

Accepted Answer

The image is the same size as the object and reversed right to left.

Question 11

A ray of light passes from air ($$n_1 = 1.00$) into water (n_2$ = 1.33) at an $$angle of $$30^	ext{o} to $$the normal. What is the angle of refraction in the water? (Use Snell's Law: $$n_1$$ \sin \$$theta_1$$ = $$n_2$$ \sin \$$theta_2)$$

Accepted Answer

$$22^	ext{o}$$

Question 12

Which of the following best describes a wave front?

Accepted Answer

A line or surface representing points of equal phase in a wave.

Question 13

In a two-dimensional corner reflector, what is the total change in direction of a ray after two reflections if the initial angle with respect to the horizontal is $$30^	ext{o}$$?

Accepted Answer

$$180^	ext{o}$$

Question 14

Which of the following is NOT a property of geometrical optics?

Accepted Answer

It accounts for the wave nature of light, including interference and diffraction.

Question 15

If a wave front is planar, what can be said about the rays associated with it?

Accepted Answer

The rays are parallel to each other.

Question 16

A student observes that the image in a plane mirror is upright and appears to be the same distance behind the mirror as the object is in front. What principle does this illustrate?

Accepted Answer

Law of reflection

Question 17

Which real-world example best illustrates the concept of refraction?

Accepted Answer

A rainbow forming after rain.

Question 18

What is the main reason why rays leaving water are bent away from the normal?

Accepted Answer

The speed of light is less in water than in air.

Question 19

Which of the following is a correct statement about the direction of propagation of light when it passes from one medium to another?

Accepted Answer

It changes direction if the speed of light changes in the new medium.

Question 20

Which of the following best describes the relationship between the incident ray, reflected ray, and the normal in the law of reflection?

Accepted Answer

They all lie in the same plane.

Geometrical Optics: Reflection and Refraction of Light (3)

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