Question

Which of the following are types of light pollution?
(A) Glare
(B) Skyglow
(C) Light trespass
(D) All of the above

Answer 1

In simple words, light pollution is the excessive illumination by artificial sources of light. The light which causes irritation and uneasiness in our vision temporarily is called light pollution. Man-made sources of light most usually cause light pollution, but sometimes natural sources of light are also responsible for it.

Complete step by step answer:
Glare is the sudden increase in the intensity of the light to which our eyes find difficulty in adjusting immediately. It can be caused by sources such as vehicle light in the night or too much sunlight in the day. Sunglasses are a good way to protect our eyes from glare.

Skyglow is the light pollution caused at night in highly populated areas due to both natural and man-made sources. The natural source involved in sky glow is the sunlight reflected from the surface of the moon and the Earth. The man-made source of a skylight involves the electric street lights that are lit at night. When light travels in the upward direction towards the sky from an upward-directed light source or after hitting the ground surface from sources such as electric lights, the reflected light partially scatters back towards the ground. This partially scattered light gives an effect of glow to the eyes which causes discomfort to us. Therefore, skyglow is a source of light pollution.

Trespassing means entering somewhere where one should not (without permission). Similarly, light trespassing means entering light in a place where it is not required or wanted. It occurs due to excessive light or improper protection from light. For example – entering sunlight into a dark room while sleeping (which is uncalled for). Using curtains in summers is a way to prevent sunlight from trespassing in the room.

Therefore, all three, glare, sky glow, and light trespass are sources of light pollution, and all the given options are correct.

So, the correct answer is Option A .

Note: Unnecessary usage of light bulbs should be avoided.Vehicle lights and street lights are the major human-made sources of light pollution also Light pollution competes with starlight in the night sky in urban residents, interferes with astronomical observatories, and, like any other form of pollution, disrupts ecosystems and has adverse health effects.