Light ,Shadow and Reflection Flashcards
Class 6
What is required for us to see objects in a dark room?
Light is required to see objects.
What are luminous objects?
Objects that give out or emit light of their own, such as the Sun and a torch.
Define opaque objects.
Objects that do not allow light to pass through them at all.
Define transparent objects.
Objects that allow light to pass through them completely.
Define translucent objects.
Objects that allow light to pass through, but not very clearly.
What forms a shadow?
A shadow is formed when an opaque object blocks light from a source.
What do we need to see a shadow?
A source of light and an opaque object.
True or False: Shadows can be seen without a screen.
False.
What is a pinhole camera?
A simple camera made using two boxes, where light passes through a small hole to create an image.
How do shadows change with the position of the object?
The shape and size of the shadow change depending on the angle of the light source and the position of the object.
What happens to images seen through a pinhole camera?
They may appear upside down and do not show colors.
What is the effect of light traveling in a straight line?
It causes shadows to form when obstructed by opaque objects.
What happens when you direct a beam of light onto a mirror?
The mirror reflects the beam of light, changing its direction.
Fill in the blank: If you cannot see through an object, it is _______.
opaque.
Fill in the blank: An object that allows some light to pass through, but not clearly, is _______.
translucent.
What is one example of a natural pinhole camera?
The gaps between leaves of a tree creating circular images of the Sun.
What is necessary to observe shadows during the day?
A light source and an opaque object.
What should you never do when observing the Sun?
Never look directly at the Sun.
What type of objects can create shadows?
Only opaque objects can create shadows.
True or False: The color of an object affects the color of its shadow.
False; shadows do not display colors.
What can be used as a screen for a shadow?
The ground, walls, or any surface can act as a screen for shadows.
What happens to the size of a shadow when the object is moved closer to the light source?
The shadow becomes larger.
What do we observe when we look through a pipe at a candle?
The candle is visible only when the pipe is straight.
