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) |
[JEE Main Held on 12-4-2019 Morning] |
A) 8.8 cm
B) 11.7 cm
C) 6.7 cm
D) 13.4 cm
Correct Answer: A
Solution :
[a] Light incident from particle P will be reflected at mirror |
This image will act as object for light getting refracted at water surface |
So, object distancebelow water surface. |
After refraction, final image is at |
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