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Observe the figure and write accurate conclusion regarding refraction of light.

Concept: Refraction of Light Through a Rectangular Glass Block
What is the correct reason for blinking / flickering of stars? Explain it.
a) The blasts in the stars.
b) Absorption of star light by the atmosphere.
c) Motion of the stars.
d) Changing refractive index of gases in the atmosphere.
Concept: Refraction of Light Through a Rectangular Glass Block
What is the correct reason for blinking / flickering of stars? Explain it.
a) The blasts in the stars.
b) Absorption of star light by the atmosphere.
c) Motion of the stars.
d) Changing refractive index of gases in the atmosphere.
Concept: Refraction of Light Through a Rectangular Glass Block
Choose and write the correct option.
If we gradually increase the angle of incidence of a ray of light passing through prism then …..
Concept: Refraction of Light
Choose the correct alternative and rewrite the following:
A glass slab is placed in the path of convergent light. The point of convergence of light
Concept: Refraction of Light Through a Rectangular Glass Block
Choose the correct alternative and rewrite the following:
A glass slab is placed in the path of convergent light. The point of convergence of light
Concept: Refraction of Light Through a Rectangular Glass Block
The phenomenon of change in the direction of light when it passes from one transparent medium to another is called ___________.
Concept: Refraction of Light
Explain how the formation of a rainbow occurs.
Concept: Refraction of Light
Fill in the blank and rewrite the completed statement:
Very fine particles mainly scatter ______ light.
Concept: Some Natural Phenomena Due to Sunlight
Explain: ‘How is a rainbow formed’?
Concept: Some Natural Phenomena Due to Sunlight
Rewrite the following statement by selecting the correct option:
If a ray of light strikes a glass slab at an angle of 600 with the surface of the slab, the angle of incidence must be __________________.
Concept: Refraction of Light Through a Rectangular Glass Block
Rewrite the following statement by selecting the correct option:
If a ray of light strikes a glass slab at an angle of 600 with the surface of the slab, the angle of incidence must be __________________.
Concept: Refraction of Light Through a Rectangular Glass Block
Observe the given figure and name the following.

| Ray AB | |
| Ray NM | |
| Ray MD | |
| ∠ r |
Concept: Refraction of Light
In refraction of light through a glass slab, the directions of the incident ray and the refracted ray are ______.
Concept: Refraction of Light
Draw the ray diagram of a glass slab having medium A and B for the velocity of light ray VA and VB respectively and define Snell's law.
- If VB = 1.5 VA, then which medium is denser?
- What is the refractive index of A with respect to B?
- What is the refractive index of B with respect to A?
Concept: Refraction of Light Through a Rectangular Glass Block
Draw the ray diagram of a glass slab having medium A and B for the velocity of light ray VA and VB respectively and define Snell's law.
- If VB = 1.5 VA, then which medium is denser?
- What is the refractive index of A with respect to B?
- What is the refractive index of B with respect to A?
Concept: Refraction of Light Through a Rectangular Glass Block
Observe the figure and name the ray AB, ray CD, ray GH.

Concept: Refraction of Light Through a Rectangular Glass Block
Observe the figure and name the ray AB, ray CD, ray GH.

Concept: Refraction of Light Through a Rectangular Glass Block
Suggest measures to minimize electricity consumption at home.
Concept: Sustainable Use of Resources
Suggest measures in bursting fire crackers in festivals and processions.
Concept: Abatement of Pollution
