Physics
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Optical fibre works on which principle?
Answer: C. Total interal reflection Optical fibre works on the principle of total internal reflection.
Answer: C. Total interal reflection
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Two light sources are coherent when
Answer: D. Their phase difference is constant Two light sources are coherent when their phase difference is constant.
Answer: D. Their phase difference is constant
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The image formed by concave lens is
Answer: B. Always virtual The image formed by concave lens is always virtual.
Answer: B. Always virtual
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A real, inverted and equal in size image can be formed by a
Answer: C. Concave mirror A real, inverted and equal in size image can be formed by concave mirror.
Answer: C. Concave mirror
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The theory associated with secondary wavelet is
Answer: C. Huygen's wave theory The theory associated with secondary wavelet is Huygen's wave theory.
Answer: C. Huygen’s wave theory
See lessThe theory associated with secondary wavelet is Huygen’s wave theory.
The coherence of two light sources means that the light waves emitted have:
Answer: C. Same phase The coherence of two light sources means that the light waves emitted have same phase.
Answer: C. Same phase
See lessThe coherence of two light sources means that the light waves emitted have same phase.
The R. I. of glass is minimum for light of which colour?
Answer: A. Red The R.I. of glass is minimum for light of red colour.
Answer: A. Red
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In a certain case, the maxima and minima are equally bright and width. The pattern is due to
Answer: B. Interference In a certain case, the maxima and minima are equally bright and width. The pattern is due to interference.
Answer: B. Interference
See lessIn a certain case, the maxima and minima are equally bright and width. The pattern is due to interference.
Phase reversal takes place in case of reflection from
Answer: B. Rarer to denser medium Phase reversal takes place in case of reflection from rarer to denser medium.
Answer: B. Rarer to denser medium
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Rays associated with a plane wavefront are
Answer: C. Parallel Rays associated with a plane wavefront are parallel.
Answer: C. Parallel
See lessRays associated with a plane wavefront are parallel.