Question
Physics Question on Measurement of length
The power of a lens is 2:5 D. Its focal length is
A
10 cm
B
25 cm
C
30 cm
D
40 cm
Answer
40 cm
Explanation
Solution
The correct option is (D): 40 cm
The power of a lens is 2:5 D. Its focal length is
10 cm
25 cm
30 cm
40 cm
40 cm
The correct option is (D): 40 cm