To solve the problem, we need to identify how many focal points a lens has.
1. Understanding Focal Points of a Lens:
Every lens has two focal points:
2. Conclusion:
Thus, every lens has two focal points.
Final Answer:
The correct answer is (A) 2.
| List-I | List-II | ||
| P | If \(n = 2\) and \(\alpha = 180°\), then all the possible values of \(\theta_0\) will be | I | \(30\degree\) or \(0\degree\) |
| Q | If \(n = √3\) and \(\alpha= 180°\), then all the possible values of \(\theta_0\) will be | II | \(60\degree\) or \(0\degree\) |
| R | If \(n = √3\) and \(\alpha= 180°\), then all the possible values of \(\phi_0\) will be | III | \(45\degree\) or \( 0\degree\) |
| S | If \(n = \sqrt2\) and \(\theta_0 = 45°\), then all the possible values of \(\alpha\) will be | IV | \(150\degree\) |
| \[0\degree\] | |||