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Science · 2024 · 3 marks
CBSE 2024 · Region 2 · Set 1 · Q31
(a) Define the term power of accommodation of human eye. Write the name of the part of eye which plays a major role in the process of accommodation…
(a)
Define the term power of accommodation of human eye. Write the name of the part of eye which plays a major role in the process of accommodation and explain what happens when human eye focuses
(i)
nearby objects and (ii) distant objects.
OR
(b)
Draw a ray diagram to show the formation of a rainbow in the sky. On this diagram mark A - where dispersion of light occurs, B - where internal reflection of light occurs and C - where refraction of light occurs. List two necessary conditions to observe a rainbow.
Marking-scheme solution
Ability of the eye lens to adjust its focal length.
Ciliary muscles
(i) While focusing on nearby objects ciliary muscles contract, eye lens becomes thick and its focal length decreases.
(ii) While focusing on distant objects ciliary muscles relax, eye lens becomes thin and its focal length increases.
Diagram Reference figure $\displaystyle 10.8$ page $\displaystyle 167$ NCERT
$\displaystyle 3$ Labellings (A, B, C)
Two conditions:
(i) Presence of tiny water droplets in the atmosphere.
(ii) Position of Sun at the back(behind) the observer.
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CBSE Class 10 Science past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.