Question
Physics Question on Ray optics and optical instruments
The power of a corrective lens is -4.0 D . The lens is
A
convex lens of focal length + 25 cm
B
concave lens of focal length -25 cm
C
convex lens of focal length +4 cm
D
concave lens of focal length -4 cm
E
convex lens of focal length +20 cm
Answer
concave lens of focal length -25 cm
Explanation
Solution
The correct option is (B) : concave lens of focal length -25 cm