Question
Physics Question on Ray optics and optical instruments
Focal length of a lens is 25 cm. Its power is___
A
5D
B
6D
C
4D
D
0.04D
Answer
4D
Explanation
Solution
The correct option is (C): 4D
Focal length of a lens is 25 cm. Its power is___
5D
6D
4D
0.04D
4D
The correct option is (C): 4D