Q29.A pole is vertically submerged in swimming pool, such that it gives a length of shadow 2 . 15 m within water when sunlight is incident at an angle of 30° with the surface of water. If swimming pool is filled to a height of ) ________ . 1 . 5 m, then the height of the pole above the water surface in centimeters is (𝑛𝑤= 43 ∘
What This Question Tests
This problem requires applying Snell's law at the water surface and using trigonometry to relate the shadow length, water height, and pole height, considering the angle of incidence with the surface.
Concepts Tested
Formulas Used
n₁sinθ₁ = n₂sinθ₂
tanθ = opposite/adjacent
📚 NCERT Sections This Tests
9.5 — A Small Bulb Is Placed At The Bottom Of A Tank Containing Water To A
Physics Class 12 · Chapter 9
9.5 A small bulb is placed at the bottom of a tank containing water to a depth of 80cm. What is the area of the surface of water through which light from the bulb can emerge out? Refractive index of water is 1.33. (Consider the bulb to be a point source.)
9.4 — Figures 9.27(A) And (B) Show Refraction Of A Ray In Air Incident At 60°
Physics Class 12 · Chapter 9
9.4 Figures 9.27(a) and (b) show refraction of a ray in air incident at 60° with the normal to a glass-air and water-air interface, respectively. Predict the angle of refraction in glass when the angle of incidence in water is 45° with the normal to a water-glass interface [Fig. 9.27(c)]. FIGURE 9.27
9.6 — A Prism Is Made Of Glass Of Unknown Refractive Index. A Parallel
Physics Class 12 · Chapter 9
9.6 A prism is made of glass of unknown refractive index. A parallel beam of light is incident on a face of the prism. The angle of minimum deviation is measured to be 40°. What is the refractive index of the material of the prism? The refracting angle of the prism is 60°. If the prism is placed in water (refractive index 1.33), predict the new angle of minimum deviation of a parallel beam of light.
📋 Question Details
- Chapter
- Ray Optics
- Topic
- Refraction
- Year
- 2023
- Shift
- 06 Apr Shift 1
- Q Number
- Q29
- Type
- Numerical
- NCERT Ref
- Class 12 Physics Ch 9: Ray Optics and Optical Instruments
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