Q24.A concave mirror has radius of curvature of 40 cm . It is at the bottom of a glass that has water filled up to 5 cm (see figure). If a small particle is floating on the surface of water, its image as seen, from directly above the glass, is at a distance d from the surface of water. The value of d is close to: (Refractive index of water = 1.33 ) (1) 13.4 cm (2) 8.8 cm (3) 6.7 cm (4) 11.7 cm
What This Question Tests
This complex problem requires applying the concept of apparent depth due to refraction through water, followed by image formation by a concave mirror, and then another refraction at the water surface to find the final image position.
Concepts Tested
Formulas Used
n₁/u + n₂/v = (n₂ - n₁)/R
1/f = 1/v + 1/u
f = R/2
📚 NCERT Sections This Tests
9.1 — A Small Candle, 2.5 Cm In Size Is Placed At 27 Cm In Front Of A Concave
Physics Class 12 · Chapter 9
9.1 A small candle, 2.5 cm in size is placed at 27 cm in front of a concave mirror of radius of curvature 36 cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image? Describe the nature and size of the image. If the candle is moved closer to the mirror, how would the screen have to be moved?
9.3 — A Tank Is Filled With Water To A Height Of 12.5 Cm. The Apparent
Physics Class 12 · Chapter 9
9.3 A tank is filled with water to a height of 12.5 cm. The apparent depth of a needle lying at the bottom of the tank is measured by a microscope to be 9.4 cm. What is the refractive index of water? If water is replaced by a liquid of refractive index 1.63 up to the same height, by what distance would the microscope have to be moved to focus on the needle again?
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.)
📋 Question Details
- Chapter
- Ray Optics
- Topic
- Image Formation by Concave Mirror and Refraction
- Year
- 2019
- Shift
- 12 Apr Shift 1
- Q Number
- Q24
- Type
- Multi concept
- NCERT Ref
- Class 12 Physics Ch 9: Ray Optics and Optical Instruments
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