World Geography Questions (MCQs) for UPSC, State PCS & SSC Examinations

Q.  What is the focal length of a concave lense with number -5D?

a. 5 cm
b. 10 cm
c. 15 cm
d. 20 cm


ANSWER: See Answer
 
The focal length is the distance from the center of the lens to the principal foci (or focal points) of the lens. For a while diverging lenses always have negative focal lengths. The focal length for 5D lens in 20cm.
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