Geometric Optics

Question 1

Mirror

Answer 1

Law of reflection

Θ1 = Θ2

Question 2

Image produced by a mirror :

Answer 2

virtual, same distance, same size

Question 3

Index of refraction

Answer 3

n = c/v

c: speed of light in vacuum
v: speed of light in a medium

Question 4

Index of refraction is proportional to:

Answer 4

density of the medium

Question 5

Denser medium

Answer 5

greater n, slower v, shorter λ, and smaller Θ

Question 6

Less dense medium

Answer 6

smaller n, faster v, longer λ, and larger Θ

Question 7

Snell’s law

Answer 7

n1 sin Θ1 = n2 sin Θ2

Question 8

Critical angle

Answer 8

angle at which it will form a refracted angle of 90 degrees

Question 9

Critical angle (Snell’s law)

Answer 9

n1 sin Θ1 = n2 sin 90

Question 10

What happens when incident angle is critical angle?

Answer 10

Total internal reflection

Question 11

Image made by pinhole camera:

Answer 11

inverted at the back of the camera

Question 12

Magnification

Answer 12

hi/ho = -di/do

-hi : inverted image
+di : real image

Question 13

Image made by convex lens/concave mirror

Object outside f

Answer 13

inverted (-hi), real (+di)

Question 14

Image made by convex lens/concave mirror

Object at f

Answer 14

object at infinity

Question 15

Image made by convex lens/concave mirror

Object inside f

Answer 15

upright (+hi), virtual (-di)

Question 16

Formula for lens

Answer 16

f = R/2

1/f = 1/do + 1/di

Question 17

Image made by concave lens/convex mirror

Answer 17

No matter the place, the image is always small, upright (+hi) and virtual (-di)