refraction

Question 1

what is the relationship between wavefront and rays?

Answer 1

rays are perpendicular to wavefront

Question 2

what are the two types of wavefront?

Answer 2

. circular wavefront

. plane wavefront

Question 3

what is refraction?

Answer 3

. the wave changes direction as it enters a different medium.
. the change of direction is a result of wave slowing down or speeding up
. bending of light

Question 4

why does wavefront tilt?

Answer 4

. wavefront has been tilted because of uneven slowing as it crosses the air-glass interference

Question 5

what is the equation of refractive index?

Answer 5

refractive index = speed of light in a vacuum/velocity of light in that medium

Question 6

what is the speed of light in a vacuum?

Answer 6

300000000 m/s

Question 7

what is snells law?

Answer 7

n sin i = n' sin i'
n= incident index
n'= refractive index
i = incident angle
i' = refracted angle

Question 8

what happens when light travels from air to glass?

Answer 8

glass has a higher refractive index than air light slows down and moves towards the normal

Question 9

what happens when light travels to a medium that has a higher refractive index?

Answer 9

light moves towards the normal

Question 10

what are some applications for refraction?

Answer 10

. correcting squints
. dispersion
. displacement

Question 11

what is dispersion?

Answer 11

splitting of beam of white light into seven constituent colours when passed through a transparent medium