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Andhra Pradesh SSC (Class 10) Refraction of Light and Lenses — practice questions — page 2

Explore 140 free Refraction of Light and Lenses questions in Andhra Pradesh SSC (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 31–60 of 140.

Power P of a lens is defined as:Read the answer and worked solution →The retina of the eye is the:Read the answer and worked solution →The function of the iris is to:Read the answer and worked solution →Myopia (near-sightedness) is corrected by:Read the answer and worked solution →Hyperopia (far-sightedness) is corrected by:Read the answer and worked solution →The sky appears blue due to:Read the answer and worked solution →The colours of a rainbow are caused by:Read the answer and worked solution →Match each mirror / lens to the image it forms.Read the answer and worked solution →CLASS10 · Physics · Light — Reflection LawsRead the answer and worked solution →CLASS10 · Physics · Refraction BasicsRead the answer and worked solution →CLASS10 · Physics · Convex or Concave LensRead the answer and worked solution →CLASS10 · Physics · Mirror TypesRead the answer and worked solution →CLASS10 · Physics · Mirror FormulaRead the answer and worked solution →Spot the wrong sign convention (CBSE Cl 10 Light)Read the answer and worked solution →Match the mirror or lens to its image property (object at 2F) (CBSE Cl 10)Read the answer and worked solution →The transparent front layer of the human eye is called the:Read the answer and worked solution →The image of an object is formed on the:Read the answer and worked solution →The least distance of distinct vision for a healthy adult human eye is about:Read the answer and worked solution →Power of accommodation of the eye is the ability of the eye lens to:Read the answer and worked solution →White light splits into its colours when passed through a prism. This phenomenon is called:Read the answer and worked solution →Which defect of vision is corrected by a concave lens?Read the answer and worked solution →Which defect of vision is corrected by a convex lens?Read the answer and worked solution →In the human eye, the size of the pupil is controlled by the:Read the answer and worked solution →Why does the sky appear blue during the day?Read the answer and worked solution →A near-sighted person can see only objects nearer than:Read the answer and worked solution →Power of a corrective lens is expressed in dioptres. One dioptre equals:Read the answer and worked solution →Presbyopia is caused by:Read the answer and worked solution →Which of the following causes night blindness?Read the answer and worked solution →A person can read a book at 30 cm but cannot read it at 25 cm. The defect is:Read the answer and worked solution →A myopic person uses a lens of focal length -1.5 m. The power of this lens is:Read the answer and worked solution →

Worked practice questions

Power P of a lens is defined as:

  1. P = f (in metres)
  2. P = v / u
  3. P = u / v
  4. P = 1/f, in dioptres
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Correct answer: D. P = 1/f, in dioptres

P = 1/f where f is focal length in metres. Unit: dioptre (D). Convex lens has positive P; concave negative.

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The retina of the eye is the:

  1. Light-sensitive screen
  2. Focusing element
  3. Front cover
  4. Coloured iris
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Correct answer: A. Light-sensitive screen

The human eye works similarly to a camera. Light enters through the cornea and lens, which act as the **focusing elements**. These elements focus the light onto the back surface of the eye called the **retina**. 1. **Function**: The retina contains millions of specialized cells called photoreceptors (rods and cones) that are sensitive to light. 2. **Conversion**: When light hits these cells, they convert light energy into electrical signals, which are sent to the brain via the optic nerve. 3. **Analogy**: Just as a movie is projected onto a screen to be seen, the lens of the eye projects an image onto the retina. Therefore, the retina acts as the **light-sensitive screen** of the eye. Matching the options: - **Focusing element**: Cornea and Lens - **Front cover**: Cornea - **Coloured iris**: Iris - **Light-sensitive screen**: Retina

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The function of the iris is to:

  1. Focus the image
  2. Control the size of the pupil
  3. Convert light to signals
  4. Carry signals to the brain
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Correct answer: B. Control the size of the pupil

The iris is the colored, ring-shaped muscular diaphragm located behind the cornea. Its primary biological function is to regulate the amount of light reaching the retina. 1. **Mechanism**: The iris consists of two sets of muscles: the sphincter pupillae (which constricts) and the dilator pupillae (which expands). 2. **Action**: These muscles adjust the diameter of the **pupil**, the central opening of the eye. 3. **Light Regulation**: - In bright light, the iris constricts the pupil to prevent overexposure. - In dim light, the iris dilates the pupil to allow more light to enter. Therefore, the correct function of the iris is to **control the size of the pupil**.

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