Question

Transparent substances:
A. absorb all the light incident on them
B. allow light to pass through them
C. do not allow light to pass through them
D. allow light to pass through them only partially

Answer 1

Hint: Transparent substances are such substances through which we can see clearly. Examples of transparent materials are air, glass, water, resins, magnetic field, electric field, etc.

Complete step by step answer:
So if all of the amount of light that falls on the object passes the object then the object will be referred to as transparent. For an object to be transparent the refractive index of the object must be uniform. Light is neither scattered or absorbed by the transparent materials.
But the substances which do not permit the light to pass through them are known as opaque substances. It is not possible to see through them. Examples of opaque substances are wall, book, etc.
The substances that permit light to pass through them only partially are known as translucent substances. Translucent substances have no uniform refractive index. Examples of translucent substances are muddy water, frosted glass, etc.

Therefore, the correct choice for this given question is B.

Note:
So we conclude that transparent materials are such materials through which we are able to see clearly. This is because they have a uniform refractive index due to which it allows almost all the light to pass through it. Whereas on the other hand the opaque materials do not permit the light to pass through them due to which one cannot see through it. Another kind of materials intermediate between both the transparent and opaque are the translucent materials which permit light to pass through them partially. They have non-uniform refractive index.