Sun rays are incident on a concave mirror parallel to its principal axis. If the image of the sun is formed at 12 cm distance from a pole of the mirror. Find its radius of curvature.
Matching the following:-
Fig | ho | hi | Magnification | Image type | Size |
i | |||||
ii | |||||
ii | |||||
iv | |||||
v |
1 | 2 | 3 | 4 | 5 | 6 | |
Medium | Ice | Water | Kerosene | Flint glass | Ruby | Diamond |
Refractive Index | 1.31 | 1.333 | 1.44 | 1.66 | 1.71 | 2.42 |
No. | angle of incidence | Angle of reflection |
1 | 30o | (a) ______ |
2 | (b) _____ | 40o |
3 | 50o | (c) _____ |
4 | 60o | (d) _____ |
S.No. | Object-Distance u(cm) | Image-Distance v(cm) |
1. | -100 | +25 |
2. | -60 | +30 |
3. | -40 | +40 |
4. | -30 | +60 |
5. | -25 | +100 |
6. | -15 | +120 |
Size of image of an object by a mirror having a focal length of 20 \mathrm{cm} is observed to be reduced to 1 / 3 rd of its size. At what distance the object has been placed from the mirror? What is the nature of the image and the mirror?
The image of a candle flame formed by a lens is obtained on a screen placed on the other side of the lens. If the image is three times the size of the flame and the distance between lens and image is 80 \mathrm{cm}, at what distance should the candle be placed from the lens? What is the nature of the image at a distance of 80 \mathrm{cm} and the lens?
Fig | h_i | h_o | Magnification | Erect, virtual / inverted, real m = \dfrac{h_i}{h_o} | Size is same as that of the object / magnified / diminidhed |
Fig 1 Fig 2 Fig 3 Fig 4 Fig 5 | Negative Negative Positive Positive Positive | Positive Positive Positive Positive Positive | Negative Negative Positive Positive Positive | Inverted, real Inverted, real Direct, virtual Direct, virtual Direct, virtual | dimished Size same as object bigger than object smaller than object smaller than object |