Correct Answer - B
Transparent substance permits the passage of light in such a way that objects can be seen clearly through the substance. Because of its high refrative index `(2.5)`, diamond can reflect and refract light. Therefore, it is a transparent substance.
Translucent substance permits the passage of light in such a way that an object cannot be seen clearly through the substance, e.g., frosted glass. Opaque substance does not permit light to pass. It is neither transparent nor translucent.
