Physics-(general)
NEET Physics (general) MCQ Question
Type: MCQ-diagram based-Medium-Class 12
A diagram shows a convex lens placed in contact with a concave lens. The focal lengths of the convex and concave lenses are given as 30 cm and 20 cm respectively. Which of the following correctly describes the nature of the lens system?
A
The system acts as a converging lens.
B
The system acts as a diverging lens.
C
The system has no effective focal length.
D
The system acts as a lens with zero power.
Correct Answer
Option B
Detailed Explanation
The effective focal length of the lens system is determined by the relation 1/f = 1/f1 + 1/f2. Since the concave lens has a shorter focal length, the system acts as a diverging lens.
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