in a class of 100 student ,60 play table tennis ,20 play both volley ball and table tennis 10 play neither table tennis nor volley ball how many play at least one game in
Answers
Answer:
Rekha placed a juice bottle at a distance of 20 cm in front of a convex mirror which has a focal length of 20 cm.
To find:
Location of image ?
Calculation:
Applying MIRROR FORMULA:
\sf \dfrac{1}{f} = \dfrac{1}{v} + \dfrac{1}{u}
f
1
=
v
1
+
u
1
\sf \implies\dfrac{1}{20} = \dfrac{1}{v} + \dfrac{1}{( - 20)}⟹
20
1
=
v
1
+
(−20)
1
\sf \implies\dfrac{1}{20} = \dfrac{1}{v} - \dfrac{1}{ 20}⟹
20
1
=
v
1
−
20
1
\sf \implies \dfrac{1}{v} = \dfrac{1}{20} + \dfrac{1}{20}⟹
v
1
=
20
1
+
20
1
\sf \implies \dfrac{1}{v} = \dfrac{2}{20}⟹
v
1
=
20
2
\sf \implies v = 10 \: cm⟹v=10cm
So, image will be formed 10 cm behind mirror.
Image will be virtual, erect and diminished. These are the general characteristics of image by convex mirror.
Step-by-step explanation:
try to. solve with this example
Answer:
90
Step-by-step explanation:
Since 10 play neither table tennis nor volleyball, you subtract that from 100 students which gives you 90 students who played at least 1 game