alleryStart learning →The small natural prisms responsible for a rainbow are
- Ice crystals
- Water droplets
- Dust grains
- Air molecules
Show answer and solution
Correct answer: B. Water droplets
Water droplets refract and disperse sunlight to form a rainbow.
ICSE Class 10 Ray Optics and Optical Instruments — practice questions — page 2
Explore 86 free Ray Optics and Optical Instruments questions in ICSE Class 10 Physics. Open each question or exercise to read its content, reference answers and available explanation.
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Showing questions 31–60 of 86.
The small natural prisms responsible for a rainbow areRead the answer and worked solution →When you face a primary rainbow, the Sun is generallyRead the answer and worked solution →Which process redirects sunlight inside a rainbow-forming drop?Read the answer and worked solution →A light beam becomes visible in mist chiefly throughRead the answer and worked solution →A clear daytime sky appears blue mainly because air scattersRead the answer and worked solution →Without an atmosphere, the daytime sky would lookRead the answer and worked solution →Which band occupies the lowest-frequency end of the EM spectrum?Read the answer and worked solution →Which band has the shortest wavelengths in the EM spectrum?Read the answer and worked solution →Which invisible band lies immediately beyond visible red?Read the answer and worked solution →Which band lies just beyond the violet end of visible light?Read the answer and worked solution →UV causing a material to emit visible light is calledRead the answer and worked solution →Which band is used in germicidal irradiation lamps?Read the answer and worked solution →Sunburn is chiefly associated with excessive exposure toRead the answer and worked solution →The stratospheric ozone layer blocks much harmfulRead the answer and worked solution →Human skin at ordinary body temperature emits strongly in theRead the answer and worked solution →Special photographic sensors can detect which invisible near-visible band?Read the answer and worked solution →The part of the EM spectrum directly detected by normal human vision isRead the answer and worked solution →Index of medium B relative to A is 1.5. Index of A relative to B?Read the answer and worked solution →Relative to air, nA=1.5 and nB=1.2. Index of A relative to B?Read the answer and worked solution →Near-normal view from air: water depth 12 cm, n=4/3. Apparent depth?Read the answer and worked solution →A coin is 15 cm deep but appears 10 cm deep near normally from air. Liquid n?Read the answer and worked solution →Near-normal air view: a coin 20 cm deep in n=1.25 appears raised byRead the answer and worked solution →An oblique ray crosses a boundary between equal-index media. ItRead the answer and worked solution →Normal entry into a parallel slab gives what shift?Read the answer and worked solution →Air to glass: n=1.5 and sin i=0.6. Find sin r.Read the answer and worked solution →Using n=c/v, c=3×10^8 m/s and v=2×10^8 m/s, find n.Read the answer and worked solution →For the same light, nX=1.6 and nY=1.2. It travels slower inRead the answer and worked solution →Prism angles: incidence 40°, emergence 50°, prism 60°. Deviation?Read the answer and worked solution →A prism has A=60°, incidence 35° and deviation 25°. Emergence?Read the answer and worked solution →Glass n=1.5 borders liquid n=1.2. What is sin of the critical angle?Read the answer and worked solution →
Worked practice questions
When you face a primary rainbow, the Sun is generally
- At the rainbow's centre
- In front of observer
- Behind the observer
- Directly above observer
Show answer and solution
Correct answer: C. Behind the observer
A primary rainbow appears opposite the Sun, so the Sun is behind an observer facing it.
Which process redirects sunlight inside a rainbow-forming drop?
- Chromatic refraction
- Internal reflection
- Surface diffraction
- Optical dispersion
Show answer and solution
Correct answer: B. Internal reflection
Sunlight is internally reflected within the droplet between its entry and exit refractions.
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