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Ray Optics Physics - Ray Optics

Uttarakhand Board (UBSE) - STD 12 Science - Physics (Uttarakhand - English Medium). 540 questions in this chapter.

Question types

Ray Optics question types

540 questions across 1 question group — pick any mix to generate a Physics paper with step-by-step answer keys.

540
Questions
1
Question groups
5
Question types
Sample Questions

Ray Optics questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q (1 Marks)1 Mark
A hollow double concave lens is made of very thin transparent material. It can be filled with air or either of two liquids $L_1$ and $L_2$ having refractive indices $n_1$ and $n_2$ respectively $\left(n_2>n_1>1\right)$. The lens will diverge a parallel beam of light if it is filled with
  • A
    Air and placed in air
  • B
    Air and immersed in $L_1$
  • C
    $L_1$ and immersed in $L_2$
  • ✓
    $\mathrm{L}_2$ and immersed in $\mathrm{L}_1$

Answer: D.

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Q 2M.C.Q (1 Marks)1 Mark
Shown in the figure here is a convergent lens placed inside a cell filled with a liquid. The lens has focal length + 20 cm when in air and its material has refractive index 1.50. If the liquid has refractive index 1.60, the focal length of the system is
  • A
     + 80 cm
  • B
     – 80 cm
  • C
    – 24 cm
  • ✓
    –100 cm

Answer: D.

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Q 3M.C.Q (1 Marks)1 Mark
Diameter of a plano $–$ convex lens is $6 \ cm$ and thickness at the centre is $3 \ mm$. If the speed of light in the material of the lens is $2 \times 10^8 m/\sec,$ the focal length of the lens is
  • A
    $15 \ cm$
  • B
    $ 20 \ cm$
  • ✓
    $30 \ cm$
  • D
    $10 \ cm$

Answer: C.

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Q 4M.C.Q (1 Marks)1 Mark
A convex lens A of focal length 20 cm and a concave lens B of focal length 5 cm are kept along the same axis with the distance d between them. If a parallel beam of light falling on A leaves B as a parallel beam, then distance d in cm will be
  • A
     25
  • ✓
    15
  • C
     30
  • D
     50

Answer: B.

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Q 5M.C.Q (1 Marks)1 Mark
Assertion : The cloud in sky generally appear to be whitish.
Reason : Diffraction due to cloud is efficient in equal measure at all wavelengths.
  • A
     If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • B
     If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • ✓
     If assertion is true but reason is false.
  • D
     If the assertion and reason both are false.

Answer: C.

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