NEET Physics Lenses Assertion Reason Question
Assertion (A): A combination of a convex lens of focal length 30 cm and a concave lens of focal length 20 cm results in a diverging lens system.
Reason (R): The effective focal length of a combination of lenses is the algebraic sum of their individual focal lengths.
Both A and R are true, and R is the correct explanation of A.
Both A and R are true, but R is not the correct explanation of A.
A is true, but R is false.
A is false.
Correct Answer
Detailed Explanation
The effective focal length of a lens combination is given by the algebraic sum of individual focal lengths (Physics 238, Eq. 9.31). A positive focal length for a convex lens and a negative focal length for a concave lens result in a net negative focal length, making the combination diverging.
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