Q: Which law governs the relationship between the angle of incidence and the angle of reflection for light striking a surface?

Law of Reflection: $$\theta_i = \theta_r$$

Question 1

Which law governs the relationship between the angle of incidence and the angle of reflection for light striking a surface?

Accepted Answer

Law of Reflection: $$	heta_i = 	heta_r$$

Question 2

A beam of light strikes a smooth surface. What type of reflection occurs, and what is the characteristic of the reflected rays?

Accepted Answer

Specular reflection; rays reflect at the same angle

Question 3

When light passes from air into glass, which property of the light changes?

Accepted Answer

Wavelength

Question 4

What is the formula for the index of refraction $$n of a $$material?

Accepted Answer

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

Question 5

A light ray passes from water ($$n = 1.333) $$into air ($$n = 1.0). If $$the angle of incidence in water is $$30^\circ$$, what is the angle of refraction in air? (Use Snell's Law: $$n_i \sin 	heta_i = n_t \sin 	heta_t)$$

Accepted Answer

$$	heta_t = 41.8^\circ$$

Question 6

Which type of mirror always forms a virtual, upright, and reduced image for a real object placed anywhere in front of it?

Accepted Answer

Convex mirror

Question 7

For a concave mirror, what is the relationship between the focal length $$f$$ and the radius of curvature $$R$$?

Accepted Answer

$$f = \frac{1}{2}R$$

Question 8

A light-emitting object is placed 20.0 cm in front of a concave mirror. The image is located 28.5 cm from the mirror. What is the focal length of the mirror?

Accepted Answer

$$f = 11.8\ 	ext{cm}$$

Question 9

Which equation is used to relate object distance ($$d_o$$), image distance ($$d_i$$), and focal length ($$f) $$for mirrors and lenses?

Accepted Answer

$$\frac{1}{d_o} + \frac{1}{d_i} = \frac{1}{f}$$

Question 10

A light-emitting object is placed 20.0 cm in front of a convex mirror with a focal length of -10.0 cm. Where is the image located?

Accepted Answer

$$d_i = -6.7\ 	ext{cm}$$

Question 11

Which statement about images formed by plane mirrors is correct?

Accepted Answer

The image is virtual and upright.

Question 12

What is the main difference between how mirrors and lenses form images?

Accepted Answer

Mirrors use reflection, lenses use refraction.

Question 13

A camera lens has a focal length of 15.00 cm. If an object is 90.0 cm from the lens, where is the image formed?

Accepted Answer

$$d_i = 18.0\ 	ext{cm}$$

Question 14

Which lens type always forms a virtual, upright, and reduced image for a real object placed anywhere in front of it?

Accepted Answer

Diverging lens

Question 15

A light-emitting object is 50.0 cm from a diverging lens. The image is formed 15 cm from the lens. What is the focal length of the lens?

Accepted Answer

$$f = -21.4\ 	ext{cm}$$

Question 16

Which ray passes straight through the optical center of a lens without changing direction?

Accepted Answer

Ray incident at the optical center

Question 17

In a real image formed by a concave mirror, what is the orientation of the image relative to the object?

Accepted Answer

Inverted

Question 18

Which of the following best describes the behavior of light rays in a converging lens?

Accepted Answer

Rays bend inward, toward the principal axis

Question 19

A diamond has an index of refraction of 2.4. What is the speed of light in diamond?

Accepted Answer

$$v = 0.42c$$

Question 20

Which scenario best illustrates diffuse reflection?

Accepted Answer

Light reflecting from a rough wall

Reflection and Refraction of Light: Mirrors and Lenses

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