Light Properties and Behavior

This video tutorial for class 7 physics introduces the concept of light energy, explaining that light is a form of energy that enables sight. It discusses how light travels in straight lines, known as retin-linear propagation, and how it interacts with different mediums, such as transparent and opaque objects. The video also covers the reflection of light, using mirrors as examples, and explains how light is absorbed or reflected by different surfaces.

What is the primary role of light as discussed in the video?

• To create shadows

• To produce sound

• To give us the sensation of sight

• To provide warmth

Why can't we see objects in a dark room?

• Because light is needed to see objects

• Because objects are invisible in the dark

• Because objects disappear in the dark

• Because our eyes are closed

What is the term used to describe the straight-line travel of light?

• Zigzag propagation

• Curvilinear propagation

• Rectilinear propagation

• Circular propagation

Which medium allows light to pass through easily without creating shadows?

• Reflective medium

• Transparent medium

• Opaque medium

• Translucent medium

How does light travel from the sun to the earth?

• Through sound waves

• Through a vacuum

• Through solid objects

• Through water

What happens when light strikes a mirror?

• It passes through

• It gets absorbed

• It gets reflected

• It disappears

What is the phenomenon called when light bounces back from a surface?

• Diffusion

• Absorption

• Reflection

• Refraction

Why do we see our reflection in a mirror?

• Because the mirror reflects light back to our eyes

• Because the mirror absorbs light

• Because the mirror emits light

• Because the mirror is transparent

What happens to light when it hits an opaque object?

• It passes through

• It gets completely absorbed

• It gets reflected and absorbed

• It disappears

Which type of object reflects the least amount of light?

• Reflective object

• Opaque object

• Translucent object

• Transparent object