Team 1
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Team 2
0
Teams
Name
Score
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10
×
In concave lens , only the ______ image formed.
virtual
Oops!
Check
Okay!
Check
×
seesaw
Swap points!
Oops!
×
fairy
Take points!
5
10
15
20
25
×
gift
Win 15 points!
Okay!
×
baam
Lose 20 points!
Oops!
10
×
A convex lens is ______ lens.
converging
Oops!
Check
Okay!
Check
10
×
Lens equation is
1/u + 1/v = 1/f
Oops!
Check
Okay!
Check
10
×
The unit of power of a lens is _____.
dioptre (D)
Oops!
Check
Okay!
Check
10
×
A ______ image cannot be formed on a screen.
virtual
Oops!
Check
Okay!
Check
×
thief
Give points!
5
10
15
20
25
×
magnet
Take 20 points!
Okay!
×
shark
Other team loses 25 points!
Okay!
×
banana
Go to last place!
Oops!
10
×
Can the concave lens be used as a magnifying glass?
No
Oops!
Check
Okay!
Check
×
lifesaver
Give 20 points!
Oops!
×
seesaw
Swap points!
Okay!
×
shark
Other team loses 10 points!
Okay!
×
baam
Lose 20 points!
Oops!
10
×
Lens-maker's equation is
1/f = (n-1) (1/R1 + 1/R2)
Oops!
Check
Okay!
Check
10
×
The power of a lens is inversely proportional to its _____.
focal length
Oops!
Check
Okay!
Check
10
×
Both real and virtual image formed by a _____ lens.
convex
Oops!
Check
Okay!
Check
10
×
A ______ lens diverge the rays of light.
concave
Oops!
Check
Okay!
Check
10
×
The distance between the centre of lens and object is _______.
object distance
Oops!
Check
Okay!
Check
10
×
P= - 25 D , Which types of lens is used?
concave lens
Oops!
Check
Okay!
Check
10
×
The magnification of a real image has ______ sign because it is inverted.
minus or negative
Oops!
Check
Okay!
Check
×
Restart
Review
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