Chapter 2 · Class 10 Physics
The Human Eye and the Colourful World — Questions & Answers
Board-pattern questions from The Human Eye and the Colourful World, each with the correct answer and the reasoning behind it. 873 questions from this chapter are on TestSaathi; a few of them are below so you can see what the practice looks like before signing up.
Sample questions from The Human Eye and the Colourful World
Q1. The change in focal length of an eye lens is caused by the action of the: (a) pupil (b) retina (c) ciliary muscles (d) iris
- A.pupil
- B.retina
- C.ciliary muscles✓
- D.iris
SolutionThe ciliary muscles control the curvature of the eye lens; relaxing or contracting them changes the lens's curvature and hence its focal length, enabling accommodation — option (c).
Q2. The colour with the shortest wavelength among visible colours is:
- A.Red
- B.Yellow
- C.Green
- D.Violet✓
SolutionViolet has the shortest wavelength in the visible spectrum.
Q3. If the eyeball becomes too short, the likely defect is:
- A.Myopia
- B.Hypermetropia✓
- C.Colour blindness
- D.Cataract
SolutionA shortened eyeball causes near images to tend to form behind the retina, producing hypermetropia.
Q4. The Sun remains visible for about two minutes after actual sunset due to:
- A.Atmospheric refraction✓
- B.Absorption
- C.Diffraction by clouds only
- D.The Moon
SolutionAtmospheric refraction makes the Sun appear above the horizon after it has actually set.
Q5. The use of two different powers in one spectacle lens is characteristic of:
- A.Bifocal lenses✓
- B.Plane lenses
- C.Mirrors
- D.Prisms only
SolutionBifocal lenses provide separate powers for near and distant vision.
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