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Geometrical Optics
The focal length of a concave lens is negative. Therefore, its power should be:
Negative
Positive
Zero
Infinite
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rikazzz
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Everyday Science
When light travels in water or glass from air its speed?
increases
remains constant
becomes zero
decreases
Author:
rikazzz
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Everyday Science
A telescope can make stars look:
Bigger
Brighter
Smaller
All of above
Stars are not magnified by telescopes. Telescopes collect more light and make it brighter.
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Geometrical Optics
The study of light behavior is called
lenses
optics
mechanics
heat
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rikazzz
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Geometrical Optics
The short-sightedness can be corrected if
converging glasses are used
converging mirror is used
diverging mirror is used
diverging glasses is used
Author:
rikazzz
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Geometrical Optics
An object 4 cm high is placed at a distance of 12 cm from a concave lens, If the focal length is 8 cm then the size of the object is
10 cm
5 cm
4 cm
8 cm
Author:
rikazzz
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Geometrical Optics
The branch of optics that focuses on the creation of images is called
geometric lenses
retinal branch
geometrical optics
fiber optics
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Geometrical Optics
A diverging lens always has the same ray diagram, which forms a
curved image
large image
fat image
smaller image
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rikazzz
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Geometrical Optics
The distance between the optical center and the principal focus is known as
principal axis
optical center
principal focus
focal length
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rikazzz
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Geometrical Optics
The outer concentric shell of the fiber optics is called
diopters
core
prism
cladding
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