Two plane mirrors are inclined at 70°. A ray incident on

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Two plane mirrors are inclined at 70°. A ray incident on one mirror at angle θ after reflection falls on second mirror and is reflected from there parallel to first mirror. The value of θ is

1. 50°
2. 45°
3. 30°
4. 55°

Correct Option: A

From fig. 40° + θ = 90°
∴ θ = 90° – 40° = 50°