Question:
The following figure represents two biconvex lenses \( L_1 \) and \( L_2 \) having focal lengths 10 cm and 15 cm, respectively. The distance between \( L_1 \) and \( L_2 \) is:
The following figure represents two biconvex lenses \( L_1 \) and \( L_2 \) having focal lengths 10 cm and 15 cm, respectively. The distance between \( L_1 \) and \( L_2 \) is:
Updated On: Nov 18, 2024
- 10 cm
- 15 cm
- 25 cm
- 35 cm
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The Correct Option is C
Solution and Explanation
The distance between two lenses, when both lenses are separated by a distance \( D \), depends on their focal lengths and how they interact. For this setup with two biconvex lenses, the total distance between them \( D \) is the sum of their individual focal lengths:
\[ D = f_1 + f_2 = 10 \, \text{cm} + 15 \, \text{cm} = 25 \, \text{cm}. \]
This configuration ensures that parallel rays entering the system pass through the first lens's focus and exit the second lens as parallel rays, which is a key condition for this lens arrangement.
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