Question
What is the difference between renewable and non-renewable resources?
| Renewable Sources | Non-renewable Sources |
| 1. The resources that can be renewed by reproduction are called renewable resources. | 1. The resources that are present in fixed quantities are called non-renewable. |
| 2. Renewable resources are inexhaustible. | 2. Non-renewable resources are exhaustible. |
| 3. Renewable resources are not affected by human activities. | 3. Non-renewable resources are affected by human activities. |
| 4. They are the non-conventional sources. | 4. They are the conventional sources. |
| 5. Example: Wind energy, solar energy, and hydro energy. | 5. Example: Coal, petroleum, and natural gas. |
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A ray of monochromatic green light enters a liquid from air, as shown in Fig 4.20. The angle 1 is 45° and angle 2 is 30°. 
(a) Find the refractive index of liquid.
(b) Show in the diagram the path of the ray after it strikes the mirror and re-enters in air. Mark in the diagram the angles where ever necessary.
(c) Redraw the diagram if plane mirror becomes normal to the refracted ray inside the liquid. State the principal used.
| Sr.no. | Name | Nos. | Power rating | Time/day |
| 1 | Bulb | 4 | 100 W | 7.5 hr |
| 2 | Fans | 2 | 50 W | 10 hr |
| 3 | T.V. | 1 | 100 W | 2 hr |
| 4 | Iron | 1 | 500 W | 1 hr |
| 5 | Electric stove | 1 | 750 W | 2 hr |