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

$$2\ \text{meters}$$ behind the mirror

Q: A converging lens has a focal length of $$10\ \text{cm}. An $$object is placed $$30\ \text{cm}$$ from the lens. Where is the image formed? (Use the thin lens equation: $$\frac{1}{f} = \frac{1}{d_o} + \frac{1}{d_i})$$

$$15\ \text{cm} on $$the opposite side of the lens

Q: If the index of refraction of diamond is $$2.42$$, what is the speed of light in diamond? (Speed of light in vacuum $$c = 3.00 \times 10^8$\ \text{m/s}$$, $$n = \frac{c}{v})$$

$$1.24 \times 10^8$\ \text{m/s}$$

Question 1

Which of the following best describes the law of reflection for a light ray striking a flat mirror?

Accepted Answer

The angle of incidence is equal to the angle of reflection.

Question 2

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

Accepted Answer

$$2\ 	ext{meters}$$ behind the mirror

Question 3

Which type of reflection allows you to see your face clearly in a mirror?

Accepted Answer

Specular reflection

Question 4

A concave mirror has a radius of curvature of $$40\ 	ext{cm}. $$What is its focal length?

Accepted Answer

$$20\ 	ext{cm}$$

Question 5

Which of the following statements about convex mirrors is correct?

Accepted Answer

They always produce virtual images.

Question 6

A light ray passes from air ($$n=1.00) $$into water ($$n=1.33) at an $$angle of $$30^\circ to $$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

$$22.1^\circ$$

Question 7

Which phenomenon explains why a straw appears bent when placed in a glass of water?

Accepted Answer

Refraction

Question 8

Total internal reflection can only occur when light travels from:

Accepted Answer

A medium with higher index of refraction to a lower one

Question 9

A converging lens has a focal length of $$10\ 	ext{cm}. An $$object is placed $$30\ 	ext{cm}$$ from the lens. Where is the image formed? (Use the thin lens equation: $$\frac{1}{f} = \frac{1}{d_o} + \frac{1}{d_i})$$

Accepted Answer

$$15\ 	ext{cm} on $$the opposite side of the lens

Question 10

Which corrective lens is used to treat myopia (nearsightedness)?

Accepted Answer

Diverging lens

Question 11

A person with hyperopia (farsightedness) cannot see nearby objects clearly because:

Accepted Answer

The image is focused behind the retina

Question 12

Which of the following best describes the difference between real and virtual images?

Accepted Answer

Real images can be projected onto a screen; virtual images cannot.

Question 13

A lens has a focal length of $$-12\ 	ext{cm}. $$What type of lens is it and what kind of image does it always produce?

Accepted Answer

Diverging lens; virtual image

Question 14

If the index of refraction of diamond is $$2.42$$, what is the speed of light in diamond? (Speed of light in vacuum $$c = 3.00 	imes 10^8$\ 	ext{m/s}$$, $$n = \frac{c}{v})$$

Accepted Answer

$$1.24 	imes 10^8$\ 	ext{m/s}$$

Question 15

A ray of light in glass ($$n=1.52) $$strikes the glass-air interface at $$45^\circ. $$What is the angle of refraction in air? (Use Snell's Law: $$n_1$$ \sin \$$theta_1$$ = $$n_2$$ \sin \$$theta_2)$$

Accepted Answer

$$61.0^\circ$$

Question 16

Which part of the human eye is responsible for adjusting the amount of light entering the eye?

Accepted Answer

Iris

Question 17

A microscope uses two converging lenses. The first lens creates an image that is:

Accepted Answer

Used as the object for the second lens

Question 18

Which of the following is NOT a correct statement about the sign conventions for mirrors and lenses?

Accepted Answer

For mirrors, positive image distance is in the direction the light comes from.

Question 19

A person’s near point is $$50\ 	ext{cm}$$ from their eye. What lens power (in diopters) is needed to correct their vision so they can see objects at $$25\ 	ext{cm}$$? (Lens power $$P = \frac{1}{f}$$, with $$f in $$meters)

Accepted Answer

$$+2.0\ 	ext{D}$$

Geometric Optics: Reflection, Refraction, Lenses, and the Human Eye

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