Vidaara.orgClass 10 · Physics
CodeVID-P10-02-EYE-01
The Human Eye & Accommodation — Assignment
Name: ____________________
Roll No.: __________
Date: ____________
General Instructions
- All questions are compulsory.
- Section A carries 1 mark each, Section B 2 marks, Section C 3 marks and Section D 5 marks.
- Draw neat labelled diagrams where asked. Only final answers are given at the end — for full solutions, raise your doubts with your teacher.
Section A — Multiple Choice Questions
5 × 1 = 5 marks
1.
The light-sensitive screen of the eye is the
- A.cornea
- B.retina
- C.iris
- D.pupil
2.
The far point of a normal human eye is at
- A.25 cm
- B.50 cm
- C.infinity
- D.100 cm
3.
The eye lens is a
- A.concave lens
- B.convex lens
- C.plane mirror
- D.prism
4.
Persistence of vision lasts approximately
- A.1 s
- B.1/16 s
- C.1 minute
- D.1/2 s
5.
The muscles that change the curvature of the eye lens are the
- A.optic muscles
- B.iris muscles
- C.ciliary muscles
- D.retinal muscles
Section B — Short Answer (2 marks)
3 × 2 = 6 marks
6.
Define the power of accommodation of the eye.
7.
State the function of the iris and the pupil.
8.
What kind of image is formed on the retina?
Section C — Short Answer (3 marks)
2 × 3 = 6 marks
9.
Explain how the eye focuses on a distant and then on a near object.
10.
List any three parts of the eye and state one function of each.
Section D — Long Answer (5 marks)
1 × 5 = 5 marks
11.
Draw a labelled diagram of the human eye and explain the path of light from object to brain.
Answer Key
Section A — Multiple Choice Questions
- (B) retina
- (C) infinity
- (B) convex lens
- (B) 1/16 s
- (C) ciliary muscles
Section B — Short Answer (2 marks)
- Ability of the eye lens to adjust its focal length to see near and distant objects clearly.
- The iris controls the size of the pupil; the pupil regulates the amount of light entering.
- A real, inverted and diminished image.
Section C — Short Answer (3 marks)
- For distant: ciliary muscles relax, lens thins, focal length increases. For near: ciliary muscles contract, lens thickens, focal length decreases.
- Cornea — refracts light; retina — receives image; lens — fine-tunes focus (any three).
Section D — Long Answer (5 marks)
- Light: cornea then pupil then lens then forms real inverted image on retina; optic nerve carries signals to brain which interprets it upright.
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