NEET2023Physics-Optics
NEET 2023 Physics Lens Combination MCQ Question
Type: MCQ-conceptual-Hard-Class 12
In the figure shown here, what is the equivalent focal length of the combination of lenses (Assume that all layers are thin)?
A
-40 cm
B
-100 cm
C
-50 cm
D
40 cm
Correct Answer
Option A
Detailed Explanation
The equivalent focal length for two lenses in contact is given by 1/f = 1/f1 + 1/f2. Using the given refractive indices and radii, calculate the focal lengths and find the equivalent focal length.
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