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CBSE Class 10 Refraction of Light and Lenses — practice questions — page 3

Explore 227 free Refraction of Light and Lenses questions in CBSE 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 61–90 of 227.

The splitting of white light by a prism into colours is due to:Read the answer and worked solution →Why does a hypermetropic eye have its near point farther than 25 cm?Read the answer and worked solution →A myopic eye can be corrected by:Read the answer and worked solution →The phenomenon of bending of light caused by gas density variations in the atmosphere is called:Read the answer and worked solution →Why are danger signals such as stop lights and fire engines coloured red?Read the answer and worked solution →Two convex lenses of focal lengths 20 cm and 50 cm are placed in contact. The power of the combination is:Read the answer and worked solution →Which of the following causes the colour of the clear sky to appear blue at noon?Read the answer and worked solution →The Tyndall effect refers to the:Read the answer and worked solution →A boy can see distant objects clearly but cannot read his textbook held at 25 cm. He suffers from:Read the answer and worked solution →Why do planets NOT twinkle though stars do?Read the answer and worked solution →The bluish colour scattered toward the sides of a sunbeam is described by:Read the answer and worked solution →A full length image of a distant tall building can definitely be seen by usingRead the answer and worked solution →In torches, search lights and headlights of vehicles the bulb is placedRead the answer and worked solution →A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of powerRead the answer and worked solution →At noon the sun appears white asRead the answer and worked solution →Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?Read the answer and worked solution →The bluish colour of water in deep sea is due toRead the answer and worked solution →The focal length of the eye lens increases when eye musclesRead the answer and worked solution →According to the laws of reflection, the angle of reflection equals:Read the answer and worked solution →The image formed by a plane mirror is:Read the answer and worked solution →A spherical mirror whose reflecting surface curves inwards (towards the centre of the sphere) is called:Read the answer and worked solution →For a spherical mirror of small aperture, the relation between radius of curvature R and focal length f is:Read the answer and worked solution →A concave mirror has a radius of curvature of 20 cm. Its focal length is:Read the answer and worked solution →Which mirror is used as a rear-view mirror in vehicles?Read the answer and worked solution →An object is placed at the centre of curvature C of a concave mirror. Its image is:Read the answer and worked solution →The New Cartesian Sign Convention takes distances measured against the direction of incident light as:Read the answer and worked solution →In the mirror formula 1/v + 1/u = 1/f, what does u represent?Read the answer and worked solution →An object is placed 30 cm in front of a concave mirror of focal length 10 cm. The image distance is:Read the answer and worked solution →Magnification m for a spherical mirror is given by:Read the answer and worked solution →A 4 cm tall object placed at 20 cm gives an image at -40 cm (concave mirror). The image is:Read the answer and worked solution →

Worked practice questions

The splitting of white light by a prism into colours is due to:

  1. Different intensities of colours
  2. Different speeds of colours in the glass
  3. Reflection from the prism
  4. Absorption inside the prism
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Correct answer: B. Different speeds of colours in the glass

1. White light contains many wavelengths. 2. The refractive index of glass depends on wavelength. 3. Shorter wavelengths travel slower and bend more in the prism. 4. Longer wavelengths bend less, so colours separate. 5. This wavelength-dependent speed produces dispersion. 6. So the cause is different speeds (and hence indices) for different colours. _Source: syllabus Science Ch 11 'Human Eye and the Colourful World'_

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Why does a hypermetropic eye have its near point farther than 25 cm?

  1. The retina is too thick
  2. The eyeball is too long
  3. The eyeball is too short or the lens is too flat
  4. The pupil is too small in general usage
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Correct answer: C. The eyeball is too short or the lens is too flat

1. In hypermetropia the eye's converging power is too weak. 2. This happens when the eyeball is too short relative to the lens. 3. Alternatively the lens may be too flat (low curvature). 4. Near rays converge behind the retina, giving a blurred image. 5. So the near point shifts farther than 25 cm. 6. A convex lens compensates by adding converging power. _Source: syllabus Science Ch 11 'Human Eye and the Colourful World'_

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A myopic eye can be corrected by:

  1. No lens
  2. Convex lens of suitable power
  3. Cylindrical lens
  4. Concave lens of suitable power
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Correct answer: D. Concave lens of suitable power

1. In myopia distant rays focus before the retina. 2. A concave (diverging) lens spreads rays apart slightly before they enter. 3. The eye then focuses these less convergent rays onto the retina. 4. The required power is negative. 5. So a concave lens of suitable focal length corrects myopia. _Source: syllabus Science Ch 11 'Human Eye and the Colourful World'_

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