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ISC Class 12 Ray Optics and Optical Instruments — practice questions

Explore 55 free Ray Optics and Optical Instruments questions in ISC Class 12 Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Ray Optics and Optical Instruments questions and exercises with answers

Showing questions 1–30 of 55.

Higher or Lower: Refractive Index (ISC 12)Read the answer and worked solution →Odd One Out: Optics Devices (ISC 12)Read the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Assertion and reason: instrumentsRead the answer and worked solution →NEET · Physics · Image — Real or VirtualRead the answer and worked solution →Complete the definition of lens powerRead the answer and worked solution →Tap every statement true of refractionRead the answer and worked solution →Order the reasoning: why an optical fibre worksRead the answer and worked solution →True or false: mirrors and lensesRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Complete the condition for total internal reflectionRead the answer and worked solution →Two thin lenses of powers $+5\,\text{D}$ and $-3\,\text{D}$ are placed in CONTACT. The total power of the combination isRead the answer and worked solution →Match each instrument to its magnifying powerRead the answer and worked solution →NEET · Physics · True or False — OpticsRead the answer and worked solution →Flip and pair: symbol with meaningRead the answer and worked solution →True or false: the sign conventionRead the answer and worked solution →Snell's law of refraction at the boundary between two media of refractive indices $n_1$ and $n_2$ statesRead the answer and worked solution →The POWER of a lens (in diopters, D) is defined asRead the answer and worked solution →A convex mirror always forms an image of a real object that is:Read the answer and worked solution →The critical angle for total internal reflection at a glass-air interface is $42^\circ$. The refractive index of the glass is approximately:Read the answer and worked solution →An object is placed 30 cm from a concave mirror of focal length 20 cm. The image distance isRead the answer and worked solution →Converging or diverging?Read the answer and worked solution →Two plane mirrors are inclined at an angle of $60^\circ$. The number of images of a point object placed between them is:Read the answer and worked solution →An object is placed $30\,\text{cm}$ in front of a concave mirror of focal length $20\,\text{cm}$. The image distance from the mirror is:Read the answer and worked solution →True or false: optical fibresRead the answer and worked solution →Reading the laws backRead the answer and worked solution →The relationship between the focal length $f$ and the radius of curvature $R$ for a SPHERICAL MIRROR isRead the answer and worked solution →A converging lens of focal length $20\,\text{cm}$ produces a real image at $30\,\text{cm}$ from the lens. The object distance is closest toRead the answer and worked solution →When light travels from one medium to another, which property of the wave REMAINS UNCHANGED?Read the answer and worked solution →An object is placed at the FOCUS of a concave mirror ($u = f$, both negative). The image forms atRead the answer and worked solution →

Worked practice questions

Higher or Lower: Refractive Index (ISC 12)

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Questions
  1. A
    Refractive index of diamond (2.42)
    B
    Refractive index of water (1.33)
    Higher value
    Refractive index of diamond (2.42)
  2. A
    Speed of light in glass
    B
    Speed of light in vacuum
    Higher value
    Speed of light in vacuum
  3. A
    Refractive index of glass (1.5)
    B
    Refractive index of air (1.0)
    Higher value
    Refractive index of glass (1.5)
  4. A
    Wavelength of red light
    B
    Wavelength of violet light
    Higher value
    Wavelength of red light
  5. A
    Focal length of a thick lens
    B
    Focal length of a thin lens (more curved)
    Higher value
    Focal length of a thick lens
Instructions
Tap the side with the higher value.

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Odd One Out: Optics Devices (ISC 12)

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Questions
  1. Items
    1. Resistor
    2. Convex lens
    3. Concave lens
    4. Plane mirror
    Odd item
    Resistor
  2. Items
    1. Microscope
    2. Galvanometer
    3. Telescope
    4. Magnifying glass
    Odd item
    Galvanometer
  3. Items
    1. Reflection
    2. Refraction
    3. Electrolysis
    4. Diffraction
    Odd item
    Electrolysis
  4. Items
    1. Red
    2. Green
    3. Violet
    4. Sound
    Odd item
    Sound
Instructions
Tap the item that does not belong.

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Spot the one that does not belong

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Questions
  1. Items
    1. Diamond's sparkle
    2. Mirage
    3. Rainbow
    Odd item
    Rainbow
  2. Items
    1. Snell's law
    2. Mirror equation
    3. Thin lens formula
    Odd item
    Snell's law
  3. Items
    1. Dioptre
    2. Metre
    3. Power
    Odd item
    Metre
  4. Items
    1. Objective
    2. Eyepiece
    3. Critical angle
    Odd item
    Critical angle
Each group is one summary point. Source: syllabus Physics Part II, Ch 9 Ray Optics and Optical Instruments.

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