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Question
Fig shows a lens as a combination of a glass block and two prisms.
- Name the lens formed by the combination.
- What is the line XX' called?
- Complete the path of the incident ray PQ after passing through the lens.
- The final emergent ray either meets XX' at a point or appears to come from a point on XX'. Label it as F, What is this point called?
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Solution
- It is a convex (converging) lens.
- XX′ is the principal axis.
Since PQ is parallel to the principal axis, after refraction it passes through the principal focus on the other side of the convex lens.- The point is the principal focus (second principal focus).
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