Question

How can you help in reducing the problem of waste disposal? Give any two

methods.

and

What is refraction? Write the laws of refraction.
​

Answer 1

Answer:

We can help in reducing the problem of waste disposal by these methods: By separating biodegradable substances from non-biodegradable substances. By reducing, reusing and recycling non-biodegradable substances. By putting the organic waste into compost pits dug in the ground and preparing compost.

Explanation:

and

the principle that for a ray, radar pulse, or the like, that is incident on the interface of two media, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of the velocity of the ray in the first medium to the velocity in the second medium and the incident ray.