Human Eye & Colourful World (Numerical with Answer)

Numerical Assignment (with Answers)


PG logo with course.JPG1. A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the nature of corrective lens to restore proper vision? [Ans: P= -0.83 Lens – concave]PG logo with course.JPG

PG logo with course.JPG2. The near point of a hypermetropic eye is at 75 cm from the eye. What is the power of the lens required to enable him to read clearly a book held at 25 cm from the eye? [Ans: P= 2.66D]PG logo with course.JPG

PG logo with course.JPG3. A myopic person uses specs of power – 0.5 D. What is the distance of far point of his eye? (Ans: 2 m)PG logo with course.JPG

PG logo with course.JPG4. A person wants to read a book placed at 20 cm, whereas near point of his eye is 30 cm. calculate the power of the lens required. [Ans: 1.67 DPG logo with course.JPG

PG logo with course.JPG5. The far point distance of a short sighted person is 1.5 meters. find the focal length, power and nature of the remedial lens? (Ans: -1.5 m, -0.67 D, concave lens) PG logo with course.JPG

PG logo with course.JPG6. A person having a myopic eye uses a concave lens of focal length 10 cm. Find the power of the lens. (Ans: -10 D)PG logo with course.JPG

PG logo with course.JPG7. A person with myopic eye cannot see objects beyond 1.2 m distinctly. What should be the nature of corrective lenses to restore proper vision? PG logo with course.JPG

Ans: Here, distance of far point, x = 1.2 m

For viewing distant objects, focal length of corrective lens, F = -x = -1.2 m,

P = 1 / f = 1 / -1.2 = -0.83D

PG logo with course.JPG8. The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem? PG logo with course.JPG

Ans: For diagram, Here, x’ = 1 m = 100 cm, d = 25 cm, f =?

From f = x’d / x’- d, F = 100*25 / 100 – 25 = 33.3 cm, P = 100 / f = 100 / 33.3 = 3 D

PG logo with course.JPG9. The far point of myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to enable him to see very distant objects distinctly? [Ans: Concave; -1.25 D] PG logo with course.JPG

PG logo with course.JPG10. The far point of a myopic person is 150 cm in front the eye. Calculate the focal length and power of a lens required to enable him to see distant objects clearly. [Ans: -1.5 m, -0.67 D] PG logo with course.JPG

                                                 PG logo with course.JPGPG logo with course.JPGPG logo with course.JPGPG logo with course.JPGPG logo with course.JPGPG logo with course.JPGPG logo with course.JPGPG logo with course.JPGPG logo with course.JPGPG logo with course.JPGPG logo with course.JPGPG logo with course.JPGPG logo with course.JPGPG logo with course.JPGPG logo with course.JPGPG logo with course.JPGPG logo with course.JPGPG logo with course.JPGPG logo with course.JPGPG logo with course.JPG

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