Question 1

Which of the following statements about the image formed by a plane mirror is correct?

Accepted Answer

The image is reversed left to right.

Question 2

A person stands 2 meters in front of a plane mirror. How far behind the mirror does the image appear to be?

Accepted Answer

$$2\ 	ext{meters}$$

Question 3

Which property of a concave mirror allows it to focus parallel rays to a single point?

Accepted Answer

The curvature of the mirror

Question 4

What is the focal length $$f of a $$spherical mirror with a radius of curvature $$R = 20\ 	ext{cm}$$?

Accepted Answer

$$f = 10\ 	ext{cm}$$

Question 5

A real image is formed by a concave mirror when the object is placed:

Accepted Answer

Beyond the center of curvature $$C$$

Question 6

Which of the following best describes the image formed by a convex mirror?

Accepted Answer

Virtual, upright, and reduced

Question 7

Given an object distance $$d_o = 15\ 	ext{cm}$$ and a focal length $$f = 10\ 	ext{cm}$$ for a concave mirror, what is the image distance $$d_i$$? Use the mirror equation $$\frac{1}{f} = \frac{1}{d_o} + \frac{1}{d_i}.$$

Accepted Answer

$$d_i = 30\ 	ext{cm}$$

Question 8

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

Accepted Answer

$$\$$theta_2$$ = 22^\circ$$

Question 9

What is the index of refraction $$n of a $$material in which light travels at $$2.00 	imes 10^8$\ 	ext{m/s}$$? (Speed of light in vacuum $$c = 3.00 	imes 10^8$\ 	ext{m/s})$$

Accepted Answer

$$n = 1.5$$

Question 10

Which of the following is a necessary condition for total internal reflection to occur?

Accepted Answer

Light must travel from a medium with higher to lower index of refraction

Question 11

Calculate the critical angle $$	heta_c$$ for total internal reflection at a water-air interface ($$n_{	ext{water}} = 1.33$$, $$n_{	ext{air}} = 1.00).$$

Accepted Answer

$$	heta_c = 48.8^\circ$$

Question 12

An optical fiber has a core index $$n_{	ext{core}} = 1.667$$ and cladding index $$n_{	ext{cladding}} = 1.523. $$What is the critical angle $$	heta_c$$ for total internal reflection at the core-cladding interface?

Accepted Answer

$$	heta_c = 66.0^\circ$$

Question 13

A convex mirror has a focal length $$f = -20\ 	ext{cm}. An $$object is placed $$d_o = 60\ 	ext{cm} in $$front of the mirror. What is the image distance $$d_i$$?

Accepted Answer

$$d_i = -15\ 	ext{cm}$$

Question 14

Which of the following best explains why emergency vehicles often have their lettering reversed?

Accepted Answer

To make the letters appear normal when viewed in a rearview mirror

Question 15

A ray of light in air strikes a pane of glass ($$n = 1.5) at$$ $$30^\circ to $$the normal. What is the angle of refraction inside the glass?

Accepted Answer

$$19.5^\circ$$

Question 16

If the magnification $$m of a $$mirror is $$-2$$, what does this indicate about the image?

Accepted Answer

The image is inverted and twice as large as the object

Question 17

A 2.0 cm high object is placed 7.10 cm from a concave mirror with a radius of curvature of 10.20 cm. What is the height of the image?

Accepted Answer

$$h_i = -5.1\ 	ext{cm}$$

Question 18

Which of the following substances has the highest index of refraction according to the provided table?

Accepted Answer

Diamond

Lecture 15

Study Guide - Practice Questions

Study Guide - Flashcards