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Optics and Vision - Part 1
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Yellow cellphone will absorb _________ light and reflect ________.
blue / green and red
Black feathers will absorb ________ light and reflect ________ light.
red, blue and red / NO
Blue cars will absorb _______ light and reflect ______ light.
red and green / blue
Blue + Red = ?
Magenta
Blue + Green = ?
Cyan
Red + Green = ?
Yellow
What colours were observed in the light ray after it passed through a prism?
Red, orange, yellow, green, blue, and violet
How are mirrors and lenses useful in creating optical instruments?
They are useful in magnifying nearby and far away objects.
Which property of light do lenses represent?
Lenses demonstrate the REFRACTION of light
Which property of light do mirrors represent?
Mirrors demonstrate the REFLECTION of light.
What is the function of the iris?
The iris is a band of muscle which controls the pupil.
What is the function of the pupil?
The pupil controls the amount of light entering the eye.
What is the function of the retina?
The retina is a special lining on the back of the eye which has receptor cells that send messages to the brain.
Which one is a concave lens? Which one is a convex lens?
A. Convex. B. Concave
Refraction is a change in _______ of light as it travels from one material to another. (DIRECTION or INTENSITY?)
DIRECTION
How is the image of an object in a concave mirror?
The position, size, and type of the image depends on how close the object is to the mirror.
How is the image of an object in a convex mirror?
Image is upright and smaller that the object
7) If the light is reflecting at an angle of 30º, what is the angle of incidence?
30º
The Law of REFLECTION states that, on reflection from a smooth surface, the angle of the reflected ray is ___________ to the angle of the incident ray. (DIFFERENT or EQUAL?)
EQUAL
Give two examples of transluncent objects.
Materials that allow SOME light to pass through. Ex.: some types of cloth, stained glass.
Give two examples of opaque materials.
Materials that do NOT allow light to pass through. Ex.: wood, metal, thick plastic.
Give two examples of transparent objects.
Materials that allow light to pass through. Ex.: glass and lens.
What are non-luminous objects? Give two examples.
Objects that do not produce light but may reflect it. Ex.: Moon, most objects on Earth.
What is a luminous object? Give two examples.
Objects that produce light. Ex.: Sun, light bulb, flashlight, fire.
What is the difference between umbra and penumbra?
Umbra: fully shaded region. Penumbra: partially shaded region.
Light travels in ___________ lines from its source, it cannot bend around objects (CURVED or STRAIGHT?)
STRAIGHT


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