Question

When light travels from rarer to denser medium the width of wavefront

4 points

A Increases

B Decreases

C Remains constant

D Increases up to 30 degree then decreases

​

Answer 1

Answer:

decreases

When light travels from a denser medium to a rarer medium, it bends away from the normal, as illustrated to the left. This behavior follows from Snell's Law.

Answer 2

Answer:

Speed of light is lower in optically denser medium by definition of refractive index. Refractive index of a medium 1 wrt another medium 2 is defined as:

μ

21

=

v

2

v

1

where:

v

1

; speed of light in medium 1

v

2

: speed of light in medium 2

When, light travels from rarer to denser medium,

μ

21

>1

v

2

<v

1

Hence, speed reduces