Geometrical OpticsHard
Question
Look at the ray diagram show, what will be the focal length of the 1st and the 2nd lens. if the incident light ray passed without any deviation ?
Options
A.- 5 cm and + 10 cm
B.+ 5cm and + 10 cm
C.- 5 cm and + 5 cm
D.+ 5 cm and + 5 cm
Solution
From figure 1st behave as diverging and 2 nd behave as converging
In 1 st incident ray appear to pass at 5 cm distance point and after refraction it becomes parallel to principle axis i.e the focal length f = - 5 cm and for second f = 5 cm
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