NEET2017PhysicsRay OpticsActual
A beam of light from a source L is incident normally on a plane mirror fixed at a certain distance x from the source. The beam is reflected back as a spot on a scale placed just above the source L . When the mirror is rotated through a small angle θ , the spot of the light is found to move through a distance y on the scale. The angle θ is given by
Options
- Ay 2 x
- By x
- Cx 2 y
- Dx y
Correct answer
A. y 2 x
Step-by-step solution
When mirror is rotated by θ angle reflected ray will be rotated by 2 θ . for small θ, y x = 2 θ θ = y 2 x