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boom
Lose 50 points!
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seesaw
Swap points!
Okay!
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shark
Other team loses 15 points!
Okay!
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thief
Give points!
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25
15
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What is the main goal of corrective lenses?
To focus light properly on the retina
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15
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Hypermetropia (farsightedness) happens because the eyeball is:
Too short
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boom
Lose 50 points!
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fairy
Take points!
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25
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gift
Win 25 points!
Okay!
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thief
Give points!
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lifesaver
Give 15 points!
Oops!
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rocket
Go to first place!
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fairy
Take points!
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25
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thief
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15
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What causes myopia (nearsightedness)?
Eyeball is too long
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15
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Used in some stores for security to monitor large areas.
CONVEX
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When you hold this mirror close to your face, your reflection looks bigger.
CONCAVE
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What lens corrects myopia?
concave lens
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What type of lens is used to correct hypermetropia?
Convex lens
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Presbyopia usually occurs due to:
Weaken ciliary muscles/ loses flexibility
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Used by drivers to see a wider view of the road behind them.
CONVEX
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15
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A concave lens has a focal length of 4 cm. An object is placed 8 cm in front of the lens. Find the image distance.
8 CM
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What type of lens corrects astigmatism?
cylindrical lens
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15
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A concave lens has a focal length of 20 cm. An object is placed 40 cm from the lens. Find the image distance.
40 CM
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15
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A concave lens has a focal length of 10 cm. An object is placed 20 cm in front of the lens. Find the image distance.
20 CM
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