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UP Board Class 10 Refraction of Light and Lenses — practice questions — page 5

Explore 144 free Refraction of Light and Lenses questions in UP Board Class 10 Science. Open each question or exercise to read its content, reference answers and available explanation.

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Refraction of Light and Lenses questions and exercises with answers

Showing questions 121–144 of 144.

Presbyopia arises because:Read the answer and worked solution →A bifocal lens used for presbyopia + myopia has:Read the answer and worked solution →A myopic person has a far point of 1 m. The focal length of the corrective concave lens is:Read the answer and worked solution →A hypermetropic person has a near point of 1 m. The focal length of the corrective convex lens is:Read the answer and worked solution →The splitting of white light into its constituent colours by a prism is called:Read the answer and worked solution →Newton showed that white light can be reformed from the spectrum using:Read the answer and worked solution →A rainbow always forms in the sky:Read the answer and worked solution →The twinkling of stars is due to:Read the answer and worked solution →Planets do not twinkle as much as stars because:Read the answer and worked solution →The blue colour of the sky is best explained by:Read the answer and worked solution →In a young eye, the focal length range of the eye lens is approximately:Read the answer and worked solution →The phenomenon of dispersion was first scientifically demonstrated by:Read the answer and worked solution →Tyndall effect refers to:Read the answer and worked solution →A myopic person's far point is 50 cm. The corrective lens has power:Read the answer and worked solution →Cataract refers to:Read the answer and worked solution →A 10-cm-tall object placed 30 cm in front of a 20-cm concave mirror has an image at:Read the answer and worked solution →Scattering of light is most pronounced when the wavelength of light is:Read the answer and worked solution →The image formed on the retina by the human eye is:Read the answer and worked solution →A child cannot read words on the blackboard clearly. The likely defect and correction are:Read the answer and worked solution →Match each part of the eye to its jobRead the answer and worked solution →Myopia or hypermetropia?Read the answer and worked solution →Put the spectrum in orderRead the answer and worked solution →Key in the eye numberRead the answer and worked solution →Which one does NOT belong?Read the answer and worked solution →

Worked practice questions

Presbyopia arises because:

  1. The ciliary muscles weaken and the lens loses flexibility with age
  2. The retina detaches
  3. The optic nerve thickens (option)
  4. The iris loses pigment
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Correct answer: A. The ciliary muscles weaken and the lens loses flexibility with age

1. Presbyopia is an age-related loss of accommodation. 2. It is caused by weakening of ciliary muscles and reduced lens flexibility. 3. Near vision becomes hard; reading glasses (convex lenses) are needed. _Source: syllabus Science, Ch 10 "The Human Eye and the Colourful World", §10.2_

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A bifocal lens used for presbyopia + myopia has:

  1. Upper convex portion and lower concave portion
  2. Upper concave portion and lower convex portion
  3. Two convex portions of equal power
  4. Two concave portions of equal power
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Correct answer: B. Upper concave portion and lower convex portion

1. Distant vision needs a concave lens, used for looking ahead — placed on top. 2. Near vision (reading) needs a convex lens — placed at the bottom. 3. The bifocal stacks the two together. _Source: syllabus Science, Ch 10 "The Human Eye and the Colourful World", §10.2_

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A myopic person has a far point of 1 m. The focal length of the corrective concave lens is:

  1. +100 cm
  2. -50 cm
  3. -100 cm
  4. -25 cm
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Correct answer: C. -100 cm

1. The corrective lens must form the image of infinity at the far point (1 m in front). 2. For lens formula with u = ∞, v = -100 cm, we get f = -100 cm. 3. Hence a concave lens of focal length -100 cm (power -1 D) is needed. _Source: syllabus Science, Ch 10 "The Human Eye and the Colourful World", §10.2_

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