Choose the correct options for the following questions.
Conventionally, all the distances p, q, f are measured from _____ of the lens
Difficulty: Easy
A:
focus
B:
optical centre
C:
edges
D:
none
If the object and its image are located at a distance of 5 cm from the focus of a convex lens, the focal length of the lens will be:
Difficulty: Easy
A:
5 cm
B:
10 cm
C:
20 cm
D:
25 cm
A ray passing through optical centre of a lens, after refraction:
Difficulty: Easy
A:
Passes through focus
B:
Go undeviated
C:
Retraces its path
D:
Both b and c
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