L2 Reflection Refraction of Light At Plane Surfaces

Question 1

refractive index relationship for mirror surface

Answer 1

n’ = -n
follows sign convention rule. incident ray travels from left to right (+1), reflected ray travels from right to left (-1)

Question 2

define real space

Answer 2

Space left of interface (infront of mirror)

Object/image within is real

Question 3

Define virtual space

Answer 3

Space right of interface (behind mirror )

Object/image within is virtual

Question 4

explain vergence and state its unit

Answer 4

-the distance between an object/image and the LENS
-reciprocal of the radius of the wavefront
OR
-refractive index of medium divided by distance (in m, take note if negative or positive depending on type of vergence)

Question 5

How to describe object and image

Answer 5

• position: Infront or behind surface or at infinity
• orientation: upright or inverted
• attitude: real or virtual
• size: same, large or small
• real and inverted go together
• upright and virtual go together

Question 6

explain refraction in parallel-sided surfaces and its assumption

Answer 6

the emergent angle will be the same as the incident angle in a parallel glass box if

parallel-sided glass block surrounded by same medium

Question 7

Define apparent position

Answer 7

When the object appears above the actual object

Question 8

Define apparent thickness

Answer 8

apparent depth of a parallel-sided plate VIEWED NORMAL TO ITS SURFACE

Question 9

What is the relationship between actual and apparent position of an object

Answer 9

N/depth = N'/depth'
OR
n(water)/depth = n(air)/depth’