NEET · Physics · STD 12 - 9. Ray optics and optical instruments
In a certain camera, a combination of four similar thin convex lenses are arranged axially in contact. Then the power of the combination and the total magnification in comparison to the power \((p)\) and magnification \((m)\) for each lens will be, respectively
- A \(4 p\) and \(4 m\)
- B \(p^4\) and \(4 m\)
- C \(4 p\) and \(m^4\)
- D \(p^4\) and \(m^4\)
Answer & Solution
Correct Answer
(C) \(4 p\) and \(m^4\)
Step-by-step Solution
Detailed explanation
When a combination of lens is used then total power
\(\begin{aligned} P_{\text {net }} & =P+P+P+P \\ & =4 P \end{aligned}\)
Total magnification \(m _{ net }= m \times m \times m \times m = m ^4\)
\(\begin{aligned} P_{\text {net }} & =P+P+P+P \\ & =4 P \end{aligned}\)
Total magnification \(m _{ net }= m \times m \times m \times m = m ^4\)
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