5598063
Description
Flashcards by Farha Idrees, updated more than 1 year ago
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Created by Farha Idrees
almost 8 years ago
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| Question | Answer |
| What does emit mean? | To produce and give off: -The Sun emits light. |
| Give two examples of sources of light. | -The Sun -Electric light bulbs -Fires |
| What are objects that emit light called? | Luminous objects |
| Why do we see the Moon? | We see the Moon as it reflects light from the Sun, and then enters our eyes. |
| The Sun gives out ____ of light. | ray: a narrow beam of straight light |
| All light travels in _______ lines. | All light travels in [straight] lines. |
| Why do shadows form? | Shadows are formed because light travels in straight lines and cannot travel around or through an object, unless the object is transparent. |
| What are the factors on which the size of a shadow depends on? (2) | -the distance the shadow is away from the light source -the distance between the shadow and the screen (the surface). |
| ______ surfaces are better reflectors than _______ surfaces. [ shiny, dull ] | [Shiny] surfaces are better reflectors than [dull] surfaces. |
| What is the best reflector called? | a mirror. |
| Do mirrors absorb or reflect light? | Mirrors reflect light. |
| What are the four features of a mirror image? | -the same way up -the same size -the same distance behind the mirror that you are in front of -back to front |
| What are the two types of curved mirrors? | Concave and convex. |
| What is a convex mirror? | a mirror that curves outwards, allowing the person to see a wider field of view than a plane mirror |
| What is a concave mirror? | a mirror that curves inwards is called a concave mirror, and is often used to magnify an image. *concave has the word cave in it- a cave curves inwards therefore a concave mirror must do so too |
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