Light, shadows and reflection

Shadows form because:

• Shadows form because they are magical illusions.
• Shadows form because they are reflections of objects.
• Shadows form because they are made of darkness.
• Shadows form because an opaque object blocks light.

• Shadows form because their name is shadow.

What are luminous objects?

• Objects that absorb light
• Objects that reflect light
• Objects that are transparent
• Objects that emit light

Image formed in a mirror is-

• Real
• Inverted
• Transparent
• Virtual
• None

The speed of light in vacuum is:

• 186,282,458 meters per second
• 299,792,458 meters per second
• 399,792,458 meters per second
• 299,792,458 kilometers per hour
• None

We can't obtain a shadow without:

(Note: Choose 3 options)

• a mirror
• a light source
• a transparent object
• an opaque object

• a screen

Which of the following is non-luminous object:

• Sun
• Light bulb
• Candle
• Moon

• All 4 options

Define opaque objects:

• Opaque objects are objects that do not allow light to pass through them.
• Opaque objects are objects that are translucent.
• Opaque objects are objects that are transparent.
• Opaque objects are objects that allow light to pass through them.

What is the colour of the shadow?

• Black or dark grey
• Green
• White
• Blue
• Purple

The shape of the shadow depends on:

• position and orientation of the light source
• distance between the object and the light source
• material of the object
• color of the object
• None

How is a image formed?

• Light rays reflect off an object and pass through the lens of the eye, creating an upside-down image on the retina.
• Images are formed by the object projecting itself onto the eye.
• Sound waves bounce off an object and create an image in the brain.
• Light rays reflect off an object and pass through the lens of the eye, creating a right-side-up image on the retina.