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CONCAVE AND CONVEX MIRROR
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What is the main goal of corrective lenses?
To focus light properly on the retina
Which condition would most likely require bifocal or progressive lenses?
Presbyopia
Presbyopia usually occurs due to:
Weaken ciliary muscles/ loses flexibility
What type of lens corrects astigmatism?
cylindrical lens
What type of lens is used to correct hypermetropia?
Convex lens
Hypermetropia (farsightedness) happens because the eyeball is:
Too short
What lens corrects myopia?
concave lens
What causes myopia (nearsightedness)?
Eyeball is too long
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
A concave lens has a focal length of 8 cm. An object is placed 16 cm in front of the lens. Find the image distance.
16 CM
A concave lens has a focal length of 6 cm. An object is placed 12 cm in front of the lens. Find the image distance.
12 CM
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
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
Used in some stores for security to monitor large areas.
CONVEX
This mirror curves inward like a cave and can focus sunlight to start a fire.
CONCAVE
When you hold this mirror close to your face, your reflection looks bigger.
CONCAVE
The image appears smaller and shows more area than the actual object.
CONVEX
Reflects light to a small point, often used in flashlights or car headlights.
CONCAVE
Installed at street corners to help pedestrians see around blind spots.
CONVEX
A makeup artist uses this mirror to see a magnified reflection of her face.
CONCAVE
Used by drivers to see a wider view of the road behind them.
CONVEX
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