Question

Which of the following is true about observation of light?
A. When we switch on the torch we observe a beam of light
B. Sunlight can be observed in the early morning when the sun rises.
C. We can observe a beam of light from the sun through a hole.
D. All of the above.

Answer 1

Hint:There are many electromagnetic radiations with different wavelengths and frequencies like the UV rays, Microwaves, X rays, Visible spectrum, radio waves, infrared rays and so on. Light is one of the electromagnetic spectrum which is visible to the human eye. There are many sources of light, some are natural like the sun, stars, moon and some are artificial like the bulbs, tube lights, torch etc. Based on the above information, we will answer the above question.

Complete step by step answer:
Light is that part of the electromagnetic spectrum which is visible to the human eye. Light has many uses, it makes the world visible. It makes all the work possible, it also helps in photosynthesis.

Let’s go through every option and try to pick the right ones.
Option A: When we switch on the torch we observe a beam of light
Yes, this is right. When we switch on the torch, a light beam comes out of the torch.

Option B: Sun light can be observed in the early morning when the sun rises.
Yes, this is also right. When the sun rises in the east, we can see the light. There are nuclear fusion reactions taking place in the sun which is the main source of light and heat on the earth.

Option C: We can observe a beam of light from the sun through a hole.
Yes, this is also right. We can observe beams of sunlight through a hole. A small extension of this is used to prove the Tyndall effect which is nothing but when light enters a dark room through a small hole, it makes all the particles in its path visible because of collision of particles.Hence, all the options are right.

Therefore, the correct answer is option D.

Note:We need to know the basic definition of light and its properties and characteristics to answer this question. This question tests the basic real-life scenarios in our everyday lives. We also need to remember that the visible spectrum – the white light consists of seven different colors which are the VIBGYOR.