Question

We are able to see objects around us because:
A) The objects absorb light.
B) The light reflected from the object enters our eyes.
C) Light can be refracted.
D) Light travels in straight lines.

Answer 1

Objects can be classified as opaque, transparent and translucent based on the amount of light that can pass through them. Light will get reflected or absorbed by opaque objects and light will not be allowed to pass through them. Examples of opaque objects include wood, stone etc..

Complete step by step solution:
Step 1: Try to explain how the reflection of light from opaque objects works.
When light falls on an opaque object, some wavelengths of the light will get absorbed and the rest of the wavelengths will get reflected. The light that gets reflected from the objects will enter our eye and finally reach the retina to form an image of the object we just saw. An object is said to be red in colour because all the wavelengths except the red wavelength got absorbed by that object and it reflected the red wavelength. This red wavelength reached our eyes, thereby giving us an impression that the object is red in colour.
So we can conclude that we see an object because the light that got reflected from the object entered our eyes.

Thus the correct option is B.

Note: Now if we say an object is white in colour, then it means that all the wavelengths of light incident on it got reflected by that object. If we say an object is black in colour then it implies that all the wavelengths of light incident on it got absorbed by that object. Objects that allow light to pass through them are called transparent objects, eg: glass. Most of the light falling on transparent objects will pass through them without scattering. But translucent objects like paper, tissue, plastics etc.., only allow a part of the radiation to pass through them. The light passing through these objects may get scattered.