Advertisements
Advertisements
प्रश्न
Fig shows a lens as a combination of a glass block and two prisms.
(i) Name the lens formed by the combination.
(ii) What is the line XX' called?
(iii) Complete the path of the incident ray PQ after passing through the lens.
(iv) The final emergent ray either meets XX' at a point or appears to come from a point on XX'. Label it as F, What is this point called?
Advertisements
उत्तर
(i) Concave lens.
(ii) The line XX' called the principal axis.
(iii)
(iv) The final emergent ray will appear to meet XX' at a point called its second focus of the lens.
APPEARS IN
संबंधित प्रश्न
Explain the term absolute refractive index of a medium and write an expression to relate it with the speed of light in vacuum.
Why is the ratio of the velocities of light of wavelengths 4000Å and 8000Å in vacuum 1: 1?
Write the relation between the angle of incidence and the angle of refraction for a medium.
When light travels from a rarer to a denser medium, its speed ______.
How does the speed of light change when it passes from glass to water?
Select from the following the best set-up for tracing the path of a ray of light through a rectangular glass slab:
(A) I
(B) II
(C) III
(D) IV
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
Complete the ray diagram showing its emergence into the air after passing through the prism.
