Advertisements
Advertisements
प्रश्न
Choose the correct alternative and rewrite the following sentence.
A ray of light strikes the glass slab at an angle of 50°. What is the angle of incidence?
पर्याय
50°
90°
60°
40°
Advertisements
उत्तर
40°
The ray of light strikes at an angle of 50 with the horizontal. The angle of incidence is with respect to the normal, so the angle of incidence is 90° − 50° = 40°.
APPEARS IN
संबंधित प्रश्न
After tracing the path of a ray of light passing through a rectangular glass slab for four different values of the angle of incidence, a student reported his observations in tabular form as given below:
| S.No | ∠ i | ∠ r | ∠ e |
| I | 30° | 19° | 29° |
| II | 40° | 28° | 40° |
| III | 50° | 36° | 50° |
| IV | 60° | 40° | 59° |
The best observation is
(A) I
(B) II
(C) III
(D) IV
Which colour of light travels fastest in any medium except air?
Name a prism required for obtaining a spectrum of Ultraviolet light.
How does the speed of light change when it passes from glass to water?
In fig 4.18, name the ray which represents the correct path of light while emerging out through a glass block.
Fill in the blanks to complete the following sentence
When light travels from a denser to a rarer medium, its speed ……………….
Four students showed the following traces of the path of a ray of light passing through a rectangular glass slab.
The trace most likely to be correct is that of student
(A) I
(B) II
(C) III
(D) IV
(i) What is the relation between the refractive index of water with respect to air `("_aμ_\text(w))` and the refractive index of air with respect to water `("_\text(w)μ_ a)` .
(ii) If the refractive index of water with respect to air `("_aμ_\text(w))` is`5/3`. Calculate the refractive index of air with respect to water `("_\text(w)μ_ a)` .
A ray of light passes from air to water. In fig. 39, which of the ray A, B, C and D is the correct refracted ray?
Why is the colour red used as a sign of danger?
Does the depth of a tank of water appear to change or remain the same when viewed normally from above?
State the factors on which the angle of deviation depends.
Comment on the statement ‘The refractive index of glass is 3/2.’
Why does the sun appear bigger during sunset or sunrise?
What is the total reflecting prism?
Draw a diagram to show the refraction of a monochromatic light ray through an equilateral prism. On the diagram, label the incident, refracted, and emergent rays. It also indicates the angle of deviation by the letter δ.
How does the angle of deviation produced by a prism depend on the angle of incidence of light at the prism surface? Draw a graph to illustrate your answer.
Explain with the help of a diagram of how fish is able to see the objects above it.
