The power of the combination of a convex lens of focal length 50 cm and concave lens of focal length 40 cm is
a)
+1 D
b)
-1 D
c)
Zero
d)
-0.5 D
The power of the combination of a convex lens of focal length 50 cm and concave lens of focal length 40 cm is
a)
+1 D
b)
-1 D
c)
Zero
d)
-0.5 D
Question ID - 152849 | SaraNextGen Top Answer
The power of the combination of a convex lens of focal length 50 cm and concave lens of focal length 40 cm is
a)
+1 D
b)
-1 D
c)
Zero
d)
-0.5 D
|
The power of the combination of a convex lens of focal length 50 cm and concave lens of focal length 40 cm is |
|||||||
|
a) |
+1 D |
b) |
-1 D |
c) |
Zero |
d) |
-0.5 D |
1 Answer
127 votes
Answer Key / Explanation : (d) -
|
(d)
=
=2-2.5=-0.5 D |
, both 
and 
are in cm.
, both 
and 
are in cm.
127 votes
Answer Link
127