State and define the S.I. unit of power.
[2] Work, Energy and Power
Chapter: [2] Work, Energy and Power
Concept: undefined >> undefined
(a) Fig represents an incomplete diagram of a simple string pulley system. Copy this diagram on a new page and complete it and mark where the effort must be applied to lift the load.
(b) What is the velocity ratio of this system?
(c) If the pulley system is 80% efficient and the load is 720 N, then
(i) What effort must be applied to lift the load?
(ii) What work must be done must be done in lifting the load through a distance of 2 m using this machine?
[3] Machines
Chapter: [3] Machines
Concept: undefined >> undefined
What do you mean by the term refraction?
[4] Refraction of Light at Plane Surfaces
Chapter: [4] Refraction of Light at Plane Surfaces
Concept: undefined >> undefined
Does reflection also take place with the refraction?
[4] Refraction of Light at Plane Surfaces
Chapter: [4] Refraction of Light at Plane Surfaces
Concept: undefined >> undefined
What is the cause of refraction of light?
[4] Refraction of Light at Plane Surfaces
Chapter: [4] Refraction of Light at Plane Surfaces
Concept: undefined >> undefined
A ray of light is incident normally on a plane glass slab. What will be
-
- the angle of refraction and
- the angle of deviation for the ray?
[4] Refraction of Light at Plane Surfaces
Chapter: [4] Refraction of Light at Plane Surfaces
Concept: undefined >> undefined
Write the SI unit for refractive index.
[4] Refraction of Light at Plane Surfaces
Chapter: [4] Refraction of Light at Plane Surfaces
Concept: undefined >> undefined
For which colour of white light, is the refractive index of a transparent medium the least?
[4] Refraction of Light at Plane Surfaces
Chapter: [4] Refraction of Light at Plane Surfaces
Concept: undefined >> undefined
For which colour of white light, is the refractive index of glass the most?
[4] Refraction of Light at Plane Surfaces
Chapter: [4] Refraction of Light at Plane Surfaces
Concept: undefined >> undefined
State the principle of reversibility of light.
[4] Refraction of Light at Plane Surfaces
Chapter: [4] Refraction of Light at Plane Surfaces
Concept: undefined >> undefined
Define the absolute refractive index of a medium.
[4] Refraction of Light at Plane Surfaces
Chapter: [4] Refraction of Light at Plane Surfaces
Concept: undefined >> undefined
Define the term refractive index of a medium. What do you understand by the statement 'the refractive index of glass is 1.5 for white light'?
[4] Refraction of Light at Plane Surfaces
Chapter: [4] Refraction of Light at Plane Surfaces
Concept: undefined >> undefined
Is dispersion same as deviation?
[4] Refraction of Light at Plane Surfaces
Chapter: [4] Refraction of Light at Plane Surfaces
Concept: undefined >> undefined
Name the factors on which the deviation produced by a prism depends.
[4] Refraction of Light at Plane Surfaces
Chapter: [4] Refraction of Light at Plane Surfaces
Concept: undefined >> undefined
A ray of light passes from air to water. In fig., which of the ray A, B, C and D is the correct refracted ray?
[4] Refraction of Light at Plane Surfaces
Chapter: [4] Refraction of Light at Plane Surfaces
Concept: undefined >> undefined
In the fig. name the ray which represents the correct path of light while passing through a glass block.
[4] Refraction of Light at Plane Surfaces
Chapter: [4] Refraction of Light at Plane Surfaces
Concept: undefined >> undefined
Fill in the blank to complete the following sentence:
When light travels from a rarer to a denser medium, it bends ...........
[4] Refraction of Light at Plane Surfaces
Chapter: [4] Refraction of Light at Plane Surfaces
Concept: undefined >> undefined
Explain the meaning of the term refraction. A ray of monochromatic light is incident from air on a glass slab. Draw a ray diagram indicating the change in its path till it emerges out of the slab.
[4] Refraction of Light at Plane Surfaces
Chapter: [4] Refraction of Light at Plane Surfaces
Concept: undefined >> undefined
State two uses of a total reflecting prism as a reflector in place of a plane mirror.
[4] Refraction of Light at Plane Surfaces
Chapter: [4] Refraction of Light at Plane Surfaces
Concept: undefined >> undefined
Draw an í- `delta` graph for a mono chromatic raY through a glass prism of a plane and mark
(i) `delta` m, the angle of mínimum devíation
(íí) Any two values of i for which value of `delta` ís same.
[4] Refraction of Light at Plane Surfaces
Chapter: [4] Refraction of Light at Plane Surfaces
Concept: undefined >> undefined
