Advertisements
Advertisements
प्रश्न
Why upper surface of water contained in a beaker and above eye level appears silvery?
उत्तर
Critical angle for water is 49°. The rays of light entering the water from below, suffer refraction. If these rays strike the water-air surface at an angle which is greater than 48°, they get totally internally reflected. These rays on emerging out of the water, appear to come from the upper surface of the water, which in turn appears silvery.
APPEARS IN
संबंधित प्रश्न
Draw a ray diagram to show the refraction of a monochromatic ray through a prism when it suffers minimum deviation
Write a relationship between the angle of incidence and angle of refractions for a given pair of media
Which colour of light travels fastest in any medium except air?
What is meant by the statement the critical angle for diamond is 24°?
A student has traced the path of a ray of light through a glass slab as follows. If you are asked to label 1, 2, 3 and 4, the correct sequencing of labeling ∠i, ∠e, ∠r and lateral displacement respectively is
(a) 2, 1, 3, 4
(b) 1, 2, 3, 4
(c) 1, 3, 2, 4
(d) 1, 3, 4, 2
While tracing the path of a ray of light passing through a rectangular glass slab a student tabulated his observations as given below:
|
S.NO. |
∠i |
∠r |
∠e |
|
I |
60° |
40° |
61° |
|
II |
50° |
36° |
51° |
|
III |
40° |
28° |
39° |
|
IV |
30° |
20° |
31° |
The correct observations is:
(A) I
(B) II
(C) III
(D) IV
Name the phenomenon responsible in the following case:
Apparent bending of a stick in water
Why does a fisherman aim at the tail of fish during spearfishing?
How is the refractive index of a medium related to its real depth and apparent depth?
Two parallel rays of Red and Violet travelling through the air, meet the air-glass boundary as shown in the above figure. Will their paths inside the glass be parallel? Give a reason for your answer.
