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CBSE Class 10 Refraction of Light and Lenses — practice questions — page 6

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 151–180 of 227.

The lens formula for a thin lens is:Read the answer and worked solution →Total internal reflection occurs when light travels from:Read the answer and worked solution →An object placed at the focus of a concave mirror produces an image:Read the answer and worked solution →A convex lens of focal length 20 cm has an object placed at 30 cm from it. The image distance is:Read the answer and worked solution →The part of the eye that focuses light onto the retina by changing its shape is the:Read the answer and worked solution →The light-sensitive layer at the back of the eye, where the image forms, is the:Read the answer and worked solution →The defect of vision in which a person cannot see DISTANT objects clearly is:Read the answer and worked solution →Hypermetropia (far-sightedness) is corrected using:Read the answer and worked solution →The least distance of distinct vision for a normal eye is approximately:Read the answer and worked solution →Dispersion of white light by a prism produces a spectrum because:Read the answer and worked solution →A rainbow is formed by:Read the answer and worked solution →The sky appears BLUE because of:Read the answer and worked solution →The reddish appearance of the sun at sunrise and sunset is due to:Read the answer and worked solution →Twinkling of stars is caused by:Read the answer and worked solution →An old man cannot read a book held close but can see distant scenes clearly. The defect and its cure are:Read the answer and worked solution →Tyndall effect — the visible path of a beam of light through a colloid — is a result of:Read the answer and worked solution →The ability of the eye to focus on objects at different distances is called: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 →The laws of reflection apply to which reflecting surfaces?Read the answer and worked solution →The image formed by a plane mirror is always:Read the answer and worked solution →A mirror whose reflecting surface curves inwards is called:Read the answer and worked solution →A mirror whose reflecting surface curves outwards is called:Read the answer and worked solution →The centre of the sphere a mirror forms part of is the centre of:Read the answer and worked solution →The centre of curvature of a concave mirror lies:Read the answer and worked solution →The centre of curvature of a convex mirror lies:Read the answer and worked solution →The radius of the sphere the mirror forms part of is the radius of:Read the answer and worked solution →

Worked practice questions

The lens formula for a thin lens is:

  1. 1/v − 1/u = 1/f
  2. 1/v + 1/u = 1/f
  3. v + u = f
  4. v u = f
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Correct answer: A. 1/v − 1/u = 1/f

1. The thin-lens formula: 1/v − 1/u = 1/f. 2. New Cartesian sign convention: u is taken negative for real objects (on the left). 3. Compare with mirror formula 1/v + 1/u = 1/f — sign of u differs. _Source: syllabus Science Ch 9 §9.3.6 Lens Formula_

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Total internal reflection occurs when light travels from:

  1. Rarer to denser at any angle
  2. Denser to rarer above critical angle
  3. Same medium reflecting normally
  4. Denser to denser without bending
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Correct answer: B. Denser to rarer above critical angle

1. TIR requires light to travel from a DENSER to a RARER medium. 2. AND the angle of incidence must EXCEED the critical angle θ_c, where sinθ_c = n_rare / n_dense. 3. Used in optical fibres, prismatic binoculars, mirages. _Source: syllabus Science Ch 9 §9.3.4 Total Internal Reflection_

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An object placed at the focus of a concave mirror produces an image:

  1. At infinity, real and enlarged
  2. At the focus point itself
  3. At twice the focal length
  4. Behind the mirror as virtual
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Correct answer: A. At infinity, real and enlarged

1. From the mirror formula with u = −f: 1/v + 1/(−f) = 1/(−f) ⇒ 1/v = 0 ⇒ v = ∞. 2. The image forms at INFINITY, highly enlarged and real. 3. This configuration is used in searchlights, where a bright source at the focus produces a parallel outgoing beam. _Source: syllabus Science Ch 9 Table 9.1 (image formation by concave mirror)_

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