Magnifying glasses work on the principle of ____.

Air is a ____ object.

• Materials like air, water, and clear glass are called transparent.
• When light encounters transparent materials, almost all of it passes directly through them.

A partially immersed pencil in water appears bent because of ____.

Transparent objects are see-through, as they ____ the light falling on them.

Daniel wanted to design an aquarium on his own for his fish. He wants to see his fish swimming in the water all the time. Which of the following materials will be best suitable for this purpose?

Which of the following produce their own light?

A sheet of polythene is _____ and _____.

Wilson could see a coin when it fell in a bucket full of water. This is because ____.

Pick the odd one out.

Which of the following objects casts a dark shadow?

 

Which of the following let only some amount of light pass through them?

Which of the following is non-luminous?

Which of the following lets all the light falling on it pass through?

An object which produces and emits its own light is called ____.

Justin and Sam are playing a game of hide and seek. Justin is hiding behind a frosted glass partition completely. Which of the following is correct in the given situation?

Red-hot iron rod is _____ and _____.