The comparison between glass and silver metal shows that glass is transparent and metal is opaque.

• A. Glass slows down light; metal speeds it up.
• B. Glass transmits light; metal does not transmit light.
• C. Glass does not interact with light; metal reflects all light.
• D. Glass absorbs all light; metal transmits light.

Answer: (B)

This tests how light interacts with materials in terms of transmission. Glass is transparent because visible light can pass through it and emerge on the other side, though it bends (refracts) as it enters and exits. Metals, on the other hand, have many free electrons that respond to light by reflecting and absorbing much of it, so light doesn’t pass through—metal stays opaque. So the statement that glass transmits light while metal does not transmit light captures the key difference.

The other ideas aren’t accurate because light does interact with glass (it refracts and transmits), and metals don’t allow light to pass through in the visible range. Also, saying glass slows light while metal speeds it up isn’t a correct description of why one is transparent and the other is not.