The property/characteristic of laser light which enables us to focus the light to a point on a target at large distance1. Directionality2. Coherence3. Monochromecity4. Intensity
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If the beam from a laser travels a distance of 1 km, it spreads to a diameter less than1.1 m2. 1 mm3. 1 cm4.1 km
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If the beam from a powerful search light travels a distance of 1 km, it spreads to about in diameter1. 1 metre2. 1 kilometre3. 1 centimetre4. 10 centimetres
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The source of light, from which the light emitted has the property of 'directionality', is1. Laser2. Torch light3. Incandiscent bulb4. Lamp
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Emitting light only in one direction is called1. Divergence2. Directionality3. Convergence4. Interference
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The sources of light, the light emitted by them has the property 'divergence', is1. Torch light2. Sodium lamp3. Incandescent bulb4. All of these
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The spread of wavelength (or frequency) about the wavelength of maximum intensity is called….1. Band width2. Range3. Band length4. 1 and 2
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The source of light from which the light emitted is of single colour or of single wavelength, is1. Sodium vapour lamp2. Laser3. Torch light4. 1 and 2
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Emitting light in all directions is called1. Directionality2. Divergence3. Convergence4. None of these