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Showing posts with label focal lengths. Show all posts
Showing posts with label focal lengths. Show all posts

Wednesday 10 June 2015

The upper and lower portions in common type of bi-focal lenses are respectively

Question 126 The upper and lower portions in common type of bi-focal lenses are respectively
A> concave and convex
B> both concave of different focal lengths
C> convex and concave
D> both convex of different focal lengths
Answer: both convex of different focal lengths
Explanation: most convex lenses in the lower half of the frame and the least convex lenses on the upper part. Means both convex lenses of different focal lengths.


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