To obtain the powerful parallel beams of light from a vehicles headlight, one must use

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Q: 87 (NDA-I/2012)
To obtain the powerful parallel beams of light from a vehicle’s headlight, one must use

question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,20,20,6,9,20,5

keywords: 

{'silvered plane mirror': [0, 0, 0, 1], 'convex mirror': [0, 0, 0, 3], 'concave mirror': [0, 0, 2, 6], 'powerful parallel beams': [0, 0, 0, 1], 'headlight': [0, 0, 0, 2], 'light': [16, 4, 34, 62], 'front surface': [0, 0, 0, 1], 'vehicle': [0, 0, 0, 5]}

To obtain powerful parallel beams of light from a vehicle`s headlight, a concave mirror should be used.

Option 1: Front surface silvered plane mirror - This type of mirror is not suitable for obtaining parallel beams of light. The silvering on the front surface of the mirror would cause the light to scatter, resulting in a diffuse rather than focused beam.

Option 2: Back surface silvered plane mirror - Similar to the front surface silvered mirror, this type of mirror would also cause the light to scatter and not produce parallel beams.

Option 3: Concave mirror - This is the correct option. A concave mirror has a curved surface that is reflective, and the inwardly curved surface focuses the light rays to create parallel beams. The reflective surface of the concave mirror allows for the light to be concentrated towards a single point, resulting in a powerful and focused beam.

Option 4: Convex mirror - A convex mirror has an outwardly curved surface, which causes the light to diverge rather than converge. This type of mirror is commonly used in vehicle side mirrors to provide a wide field of view but does not produce powerful parallel beams.

Therefore, option 3, a concave mirror, is the correct option for obtaining powerful parallel beams of